Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2937a5e3e0ff873…

MALICIOUS

PDF

85.7 KB Created: 2021-06-12 08:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 182d3b1de30f1aa4e061cb5bdd38a463 SHA-1: 51c8a5d00473f4a26a22354426da0399abcf5126 SHA-256: d2937a5e3e0ff873768d2bc13670ccd05af98aa65db06dedc2dc3e38e144471f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crewmak.ru/pbw?utm_term=pubg+gameplay+download+mp4 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4419654/normal_5fced9b4bfa69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384159/normal_606e61134f120.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475988/normal_60b8886a80642.pdfIn PDF document text
    • https://vimanofadubob.weebly.com/uploads/1/3/5/3/135304206/jewinom-texenidesar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445103/normal_60589d6eda23b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375907/normal_5fe4b255b0c89.pdfIn PDF document text
    • https://tumupexaru.weebly.com/uploads/1/3/4/3/134333537/1966580.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476126/normal_604d13baa58fa.pdfIn PDF document text
    • https://sokudepan.weebly.com/uploads/1/3/1/8/131871622/wezulamitu-nowafewujir.pdfIn PDF document text
    • https://fapuwokezisojo.weebly.com/uploads/1/3/1/4/131453853/6644931.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420039/normal_60b8e2d02c55a.pdfIn PDF document text
    • https://tofavasexivefet.weebly.com/uploads/1/3/4/5/134578877/7777718.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446286/normal_601e017912ffe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413969/normal_604ebe00b6085.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gomedaj.pbworks.com/f/alvin_and_the_chipmunks_theme_song_download_mp3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf266751-61ac-4ac6-ac6c-68b80b993d48/download_film_dear_nathan_hello_salma_2018_lk21.pdfIn PDF document text
    • http://kunixove.pbworks.com/f/shameless_uk_season_1_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75bde889-b5d9-453c-a594-3aab03f8fe47/how_to_use_invnorm_on_ti_84_plus_ce.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/550194a4-0f1b-4d2f-a254-8284f807b079/hitachi_tv_reviews_65_inch_4k.pdfIn PDF document text
    • http://dejimebez.pbworks.com/f/portfolio_management_books_free.pdfIn PDF document text
    • http://seromazu.pbworks.com/w/file/fetch/144633048/soalan_fizik_tingkatan_4_bab_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1948bac4-3b9b-47a3-8a83-dbf7cec7378b/data_warehouse_definition_and_features.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d39b1fd-27f5-4623-8b81-4b152486f263/rexelo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b42c0913-c2b5-4ec1-94f2-53de420ecb88/zombocalypse_2_unblocked_games_wtf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7661bd8f-1c77-49ad-8afa-277b2b7a3a3a/kitchenaid_repair_parts_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6623e57e-f655-4388-8950-16bb4980fb44/why_my_keurig_is_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c4f4585-3a64-469f-9b35-221fb804174c/prefixes_list_a_to_z.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88B 5180 bytes
SHA-256: 7db1a922120acafc5f665c4868587461241ae687552807030dc99530dff715a1
font_01_sfnt_off0000fa23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA23 9660 bytes
SHA-256: 8de1e90bc61804c1c78dc827b4c71fa06f39b4378e9a7d2f92cf46009a4db95d
font_02_sfnt_off00011b60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B60 18776 bytes
SHA-256: dabf0ccc451caf4864c9b22ca91318a92e8f625b469dd0561edf59b451c7a792
font_03_sfnt_off000138c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C7 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3