Malicious PDF — malware analysis report

Static analysis result for SHA-256 93a021ebde6d19a5…

MALICIOUS

PDF

79.3 KB Created: 2021-04-02 17:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2f51d8ff6d2c425b27de0b79d9e5e2d7 SHA-1: 7bb767519bf6a8440e7b644278ff4a15a7b84ea7 SHA-256: 93a021ebde6d19a57087ebb402c619bac23ce8f02c42ede4433f5b672acb714b
186 Risk Score

Malware Insights

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

The PDF document contains a link farm designed to redirect users to various external PDF files, masquerading as a free download for Adobe PDF Reader. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to distribute malware or facilitate phishing. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest a mechanism for delivering a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/award?keyword=adobe+pdf+reader+free+download+for+windows+7+free+download PDF link annotation
    • https://nipizizit.weebly.com/uploads/1/3/0/9/130969905/bokezekagafavem-warataro.pdfIn PDF document text
    • https://wamogipoko.weebly.com/uploads/1/3/0/7/130739383/2366143.pdfIn PDF document text
    • https://lurafavef.weebly.com/uploads/1/3/0/8/130813461/5c33149ac9bcf.pdfIn PDF document text
    • https://sotogirepatobob.weebly.com/uploads/1/3/1/4/131453915/1628327.pdfIn PDF document text
    • http://davupopebuwiser.sportsontheweb.net/mapa_metro_chile_2020.pdfIn PDF document text
    • https://ruzopujiwinor.weebly.com/uploads/1/3/1/4/131452977/48c418d8f49d630.pdfIn PDF document text
    • http://toxipoxekej.medianewsonline.com/42852017718.pdfIn PDF document text
    • https://bixuduserar.weebly.com/uploads/1/3/4/8/134861961/2447729.pdfIn PDF document text
    • https://jixidaku.weebly.com/uploads/1/3/4/4/134495137/nidimobezeziro.pdfIn PDF document text
    • http://grigolia-studio.ru/aaa_defensive_driving_course_answers15m0a.pdfIn PDF document text
    • https://mobisikude.weebly.com/uploads/1/3/1/6/131606420/lawesiroxasawa.pdfIn PDF document text
    • http://reactivascotia2020.com/broadcaster_studio_pro_free4p5b0.pdfIn PDF document text
    • http://naturfresh.space/84568553489caqrv.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://lapetagalelan.myartsonline.com/operation_iraqi_freedom_campaign_dates.pdfIn PDF document text
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_e3c0e4f58d7c4968a6322e0a696ffa3f.pdf?index=trueIn PDF document text
    • http://medazupu.onlinewebshop.net/writing_task_1_tips.pdfIn PDF document text
    • https://6f2fb29c-15f2-4b08-b525-3eb91a7f0a41.filesusr.com/ugd/c3548c_9cbe0e4ae0ba4a18ae7b21c60ee30016.pdf?index=trueIn PDF document text
    • https://9c68190f-8328-4368-8349-889d122a119f.filesusr.com/ugd/c4dbd3_f28c1a0cebf4425abab80f132d9df76c.pdf?index=trueIn PDF document text
    • http://diwavubodinaroj.myartsonline.com/59466319431.pdfIn PDF document text
    • https://2aa0b900-127f-4603-a19a-6a731d3c9eb1.filesusr.com/ugd/5eaffa_063d7ebe44ac4f90bb27276f84443fca.pdf?index=trueIn PDF document text
    • http://xolavozezimodan.onlinewebshop.net/nabesoju.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_off0000edb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB4 5044 bytes
SHA-256: b0f4462fa231620badda63e76efdc2bfc76ba657d6ef9eb9cc57835689cbcd59
font_01_sfnt_off0000feed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEED 10104 bytes
SHA-256: 2e46d1923e3fbc9af6a2a5ab1fdeaa7b7b936ec2f1eb2e5353dad8015e03f82c
font_02_sfnt_off00012177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12177 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378