Malicious PDF — malware analysis report

Static analysis result for SHA-256 2899d68ac16ace86…

MALICIOUS

PDF

75.1 KB Created: 2021-04-10 13:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: dfb0b49c00ee02f9333c97ab746e4587 SHA-1: de53580ccb1d239bcb9b4ff361930561d9ca5570 SHA-256: 2899d68ac16ace867d3f10bc05fe8e4d1f666415eea716bdf2103568ca3e3f46
186 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many hosted on disposable domains, characteristic of SEO spam or phishing lures. The ML classifier also returned a high probability of maliciousness. While no scripts were explicitly extracted, the PDF structure and link farm behavior strongly suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://zajinet.ru/strik?utm_term=plato+republic+pdf+penguin PDF link annotation
    • http://gajoxuganul.iblogger.org/voyager_legend_uc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415065/normal_604481d30ee81.pdfIn PDF document text
    • https://cdn.sqhk.co/vakanaju/y94Nhf4/guilty_gear_bridget_combos.pdfIn PDF document text
    • https://cdn.sqhk.co/wizokawoxo/biahjbj/mountain_sniper_killer_gun_fps_shooting_game_3d.pdfIn PDF document text
    • https://putidano.weebly.com/uploads/1/3/4/3/134388569/553871ca.pdfIn PDF document text
    • https://wokoxulepimam.weebly.com/uploads/1/3/1/4/131438011/50e565e1.pdfIn PDF document text
    • http://rinetezomado.22web.org/diwovovobozejarowusimos.pdfIn PDF document text
    • https://cdn.sqhk.co/mukibusu/hgcRijb/die_in_100_ways_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/golomamone/48Dkigr/liforurovuxupawuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426550/normal_603ceabc25eba.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://063758de-fb2f-4258-809e-b727485bfd5a.filesusr.com/ugd/89cda4_e846377ecbdc49daaff1edafcaffdc0b.pdf?index=trueIn PDF document text
    • https://ba739632-11db-41f7-a023-683a20e55d36.filesusr.com/ugd/99835b_658180f291234312bb8dfdc8e60a361e.pdf?index=trueIn PDF document text
    • http://bipofixijanafuf.rf.gd/71993113141.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a71d85d3-cf71-4137-ba91-81604f544171/93579700867.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c2b1ed4-19db-4c80-906b-5e626d2c9910/28996478424.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b212f507-5932-47b0-8d51-024bb6b008c1/16548612501.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1c95358-8f4e-439f-81cd-8b4654c84289/tajotusafavosanowibe.pdfIn PDF document text
    • https://5b5cf7c4-d983-4e27-bd54-44d52fc9074e.filesusr.com/ugd/2f9450_041a063119e745abbae0dee38ded2ba5.pdf?index=trueIn PDF document text
    • https://4461694d-a6f7-4a69-895a-ff5ddeb3c622.filesusr.com/ugd/f504fb_2f3d2601647241cd9fee73b1a1df354c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/73858fc1-9c3a-4670-ab76-b1f5de09086d/new_drug_book_app.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB62 5168 bytes
SHA-256: 220c382c515567ed2f5e80aa5da98690bef711cb0c74cb7bea12cd1e3c813e39
font_01_sfnt_off0000ecf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF5 10520 bytes
SHA-256: 84fb65f0f4555e9804d3f71cd4b743a230085ae349c7a209c99d282d4a533103
font_02_sfnt_off000110e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E0 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3