Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f81c925c8ac8a3f…

MALICIOUS

PDF

100.1 KB Created: 2021-05-30 13:36:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f8923ba7151c8f1d44d893bd14b4b345 SHA-1: a972a353ba6c04d9286a9dadcc0c61669f53ff2d SHA-256: 3f81c925c8ac8a3f1601c6e6b340449ee7257e10ad598800d5795e503cab23c5
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to various disposable hosting sites, many of which are likely part of a link farm designed to manipulate search engine results or distribute malicious content. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=12th+physics+objective+questions+and+answers+pdf+2020 In PDF document text
    • https://gawajofanobovap.weebly.com/uploads/1/3/5/2/135296378/5254477.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4419637/normal_60b0a25c14df1.pdfIn PDF document text
    • https://wupovejiti.weebly.com/uploads/1/3/2/8/132814541/mefagopidufufep.pdfIn PDF document text
    • https://panulozeti.weebly.com/uploads/1/3/5/3/135351273/91ba766e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489599/normal_602527beb5406.pdfIn PDF document text
    • https://karimimeri.weebly.com/uploads/1/3/1/1/131164281/a1c8d4d.pdfIn PDF document text
    • https://wivovomuxa.weebly.com/uploads/1/3/7/4/137499238/kigusetokigito-jukukemiduru.pdfIn PDF document text
    • https://suxewanevot.weebly.com/uploads/1/3/4/5/134595646/1a223f17.pdfIn PDF document text
    • https://lurabokeriwima.weebly.com/uploads/1/3/7/5/137511490/xebasix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468537/normal_606c339d3c007.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477376/normal_60503bc803634.pdfIn PDF document text
    • https://famutogerene.weebly.com/uploads/1/3/4/6/134688643/sexebaxajexivuv.pdfIn PDF document text
    • https://xamelanaf.weebly.com/uploads/1/3/5/3/135331914/dujamof.pdfIn PDF document text
    • https://xafixefar.weebly.com/uploads/1/3/4/7/134714422/gidap.pdfIn PDF document text
    • https://kabirajozef.weebly.com/uploads/1/3/2/7/132740353/rusudaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491159/normal_5fd700afeb0db.pdfIn PDF document text
    • https://puxajibixitukus.weebly.com/uploads/1/3/4/4/134457664/xexiwemip_nadoxupapu_xogaf.pdfIn PDF document text
    • https://wazemuguv.weebly.com/uploads/1/3/4/4/134489137/pikanepit-putesisusuvofe.pdfIn PDF document text
    • https://jowuxedajaris.weebly.com/uploads/1/3/4/7/134716551/398cfb90c8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3e89688-d7c8-480d-96c8-c66f8c6a6565/vampire_diaries_actors_real_names.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41df01c2-56d6-47e7-90aa-988567a2af6e/fenabevulan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dcee703-2cee-4528-8da5-1382e177e17f/what_lies_beyond_the_wall_in_game_of_thrones.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF33 6040 bytes
SHA-256: 3b38e0da83fbf3651eb81f4be171a950fe6a8d2a86ac1c077b1b1a256a300c66
font_01_sfnt_off000113d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D6 2116 bytes
SHA-256: 316f78c6e162999e43ccb83d429ef85c46045bf1ac59c77d169faf589ecd4eba
font_02_sfnt_off00011d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D80 12056 bytes
SHA-256: 9e263fa49de7cd919b2afaa5ea1736b6f80fca9dd5d50ccaecdef918164f4b16
font_03_sfnt_off000146d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146D8 16216 bytes
SHA-256: df64af4ce99022cfccc60a4bd8bbb6e01021e3bdd2620f3a67b309d3b5c6fdcc
font_04_sfnt_off00015c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C70 11336 bytes
SHA-256: 9c06d7c36c032a657d1b92707f03af6aee703c8a7804edfcf81f5f7543b2792e

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