Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d610086e33461c…

MALICIOUS

PDF

87.1 KB Created: 2021-03-10 06:17:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 99b2cb964d696d45809703f3c70476f7 SHA-1: 1fd8f1baec32722e79d3333d7aee77d7a02a3595 SHA-256: b9d610086e33461c23dd62d570ce4bf7c78de449a4958574e43f787852633981
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 5

  • 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 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://gimoguvi.ru/123?utm_term=chustar+k+3.+0 PDF link annotation
    • http://introdom.ru/yoshikage_kira_theme_sheet_music_clarinetok6yr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384469/normal_5fcf9619ed78c.pdfIn PDF document text
    • http://testrun.ru/pelicula_el_conde_de_montecristo_2002_en_espaol59ljv.pdfIn PDF document text
    • http://laulu-go.ru/91311774504hczjt.pdfIn PDF document text
    • https://mulokigapasol.weebly.com/uploads/1/3/1/0/131070847/8521887.pdfIn PDF document text
    • http://cashbackmoney.info/suferan0a3nm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376380/normal_5ffe9e2f2eaaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496151/normal_5ff3b11dae258.pdfIn PDF document text
    • http://sfhgfje5df.xyz/el_gran_tarot_esoterico_manualqejc8.pdfIn PDF document text
    • http://walkover.me/lord_of_the_flies_symbol_analysis_quotesks4wg.pdfIn PDF document text
    • http://chestlune.online/745828869222ezj2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389797/normal_601da8dd65e88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391893/normal_60314d2e5ae5f.pdfIn PDF document text
    • http://tk-time.site/70891756608ww6jw.pdfIn PDF document text
    • https://nojonepidafajik.weebly.com/uploads/1/3/0/7/130775859/pijaneri-nodugik-gekejatipaw.pdfIn PDF document text
    • https://tamukatiraf.weebly.com/uploads/1/3/4/7/134766395/2917864.pdfIn PDF document text
    • http://abwaab.su/derechos_humanos_en_estados_unidos_historiar02k9.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
    • https://s3.amazonaws.com/gavobawum/amma_songs_free_masstamilan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51e73fcc-e619-41b5-bb4f-f319e0a8649a/rebume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/010bf5ac-af56-40c4-a859-b65171f39e6e/what_is_the_best_book_for_sat_prep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/643f523b-3bad-47d6-a778-401ac59e1588/44565509838.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/yeezy_350_v2_zebra_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/photo_id_card_maker_software_free.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_off0000f61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61F 4664 bytes
SHA-256: 3c800ce6d4652164a11c425fbcda7014a3c51480054eafdccac83427c9ba5c34
font_01_sfnt_off000105ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FF 10684 bytes
SHA-256: ed65d3ab6db2d16cbd76f16ac632c6e4ee2d2fb8f4f5c38100e116eebfad90af
font_02_sfnt_off00012ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC3 16300 bytes
SHA-256: 568e921ce39ba7cdc3b2dbb6d122d6ee57ed9eefc47f2c00ba0607e1d84a1181
font_03_sfnt_off0001400f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1400F 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176