Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c7965c528b9f25f…

MALICIOUS

PDF

73.2 KB Created: 2021-03-03 02:15:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1049dab1a056b3bb5cc0c3f18d6430f7 SHA-1: 5396a6074fffa890341e98363359500cbed328ad SHA-256: 7c7965c528b9f25f5a2f612aefb0c8ab5ba34045306b75accc146c49a6446c08
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/123?utm_term=how+to+solve+a+physics+problem+smbc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470968/normal_601bb1c351630.pdfIn PDF document text
    • http://pavedewono.iblogger.org/mubanoxowumokiga.pdfIn PDF document text
    • https://tedamitaza.weebly.com/uploads/1/3/0/7/130740371/c0ac5bcf2d.pdfIn PDF document text
    • https://bokirises.weebly.com/uploads/1/3/1/6/131607331/58a6e5e3c7cabf5.pdfIn PDF document text
    • http://jemulobapamiwu.mywebcommunity.org/dungeons_and_dragons_starter_book.pdfIn PDF document text
    • http://wejuzofibab.medianewsonline.com/who_is_more_dangerous_psychopath_or_sociopath.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463272/normal_601135660e395.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/defamepemigemarowefi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416504/normal_5ff64cbe8c9f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490917/normal_60036c6a9c286.pdfIn PDF document text
    • http://vuwiwetidajin.mywebcommunity.org/ditor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368468/normal_5ffa8e1b865ed.pdfIn PDF document text
    • https://savibivo.weebly.com/uploads/1/3/1/3/131381036/929283.pdfIn PDF document text
    • https://fojanatixisi.weebly.com/uploads/1/3/4/2/134265346/dewesar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409421/normal_5fc69cf9cc003.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://posujozu.epizy.com/tusigezobi.pdfIn PDF document text
    • http://juwozevukiri.rf.gd/zovomezaditoxisubonejaz.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_off0000d097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD097 5528 bytes
SHA-256: a96119d558f3eed6f4804280aeec5de67d38544a6f7ce047f572819447367f4e
font_01_sfnt_off0000e351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE351 16332 bytes
SHA-256: 930815574462eaf403adb05f3c20d0a9b49783f53cb2381591f1374d8c79ace6