Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba7e747e2f328447…

MALICIOUS

PDF

73.9 KB Created: 2021-05-17 05:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ce9035bfec14e02522c71bd084d8060f SHA-1: d2bcbc14a40d3990450db4786b4f086304fe9082 SHA-256: ba7e747e2f3284472ad469422f83bd6d234c41a3fc93188c69bfebaf36fa445d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains embedded URLs and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, appears to be a lure related to learning to code, directing users to external links like https://mezovuduw.ru/strik. The presence of numerous links and disposable hosting suggests a link farm used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/strik?utm_term=what+is+the+best+book+to+learn+coding PDF link annotation
    • https://cdn.sqhk.co/rasepotobami/je00vgc/21827854206.pdfIn PDF document text
    • https://fezagigix.weebly.com/uploads/1/3/0/8/130813643/vufajuvunara-tovofidatoro-begusaxefegup.pdfIn PDF document text
    • https://cdn.sqhk.co/zijopenuxafi/gididjf/90514961829.pdfIn PDF document text
    • http://chambre.xyz/zifebuwisedwutgh.pdfIn PDF document text
    • https://xikixofifot.weebly.com/uploads/1/3/4/5/134597691/molariw_xuwixatepofaz_tetade.pdfIn PDF document text
    • http://pisufixefonof.scienceontheweb.net/breast_cancer_project.pdfIn PDF document text
    • http://sethel.xyz/566453689830771t.pdfIn PDF document text
    • https://nabovuguxobe.weebly.com/uploads/1/3/1/8/131871891/tubizesokoxox_revipazavidop_vokurupoba.pdfIn PDF document text
    • https://cdn.sqhk.co/saxezekobida/aIBqR5l/sazovitifaj.pdfIn PDF document text
    • http://artrosil.xyz/404620657976uhe5.pdfIn PDF document text
    • https://cdn.sqhk.co/kominepoli/iUkgc3I/4x4_suv_off_road_extreme_jeep_game_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://refusunono.onlinewebshop.net/download_english_books_online.pdfIn PDF document text
    • http://juvusowupu.onlinewebshop.net/guwipizufolo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5ee6899-79cf-4bf4-bcd5-279b34f1c95c/life_cycle_9500hr_exercise_bike_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/554afcc8-c42f-434d-93de-d29faa6c78ea/roland_spd-sx_software_download.pdfIn PDF document text
    • http://zonadomafi.rf.gd/cheap_sheets_sets_queen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5978312d-337d-4815-9811-d0f011af9208/59934608395.pdfIn PDF document text
    • http://nemunuj.rf.gd/suneve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89ea42f1-df57-4502-ab1d-99dd3b480f22/2020_ford_mustang_shelby_gt500_price_malaysia.pdfIn PDF document text
    • http://legizoro.epizy.com/arduino_comparison_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3492397c-287c-41ae-965c-e5f35061bec7/romeo_julieta_short_churchill_cigars.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03F 5420 bytes
SHA-256: a89b7a190848e8630e265ed10a451e1072405dc50ed91a5d8a1cb39f9a304fe2
font_01_sfnt_off0000f2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AD 11120 bytes
SHA-256: a980db8819defd3401f6877b0cb16fc64953d78bb27abde1e19e64a3440415a2

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