Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4fea8ec84002e72…

MALICIOUS

PDF

97.2 KB Created: 2021-04-21 08:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4ecad0f23cf800ce905494ab22b5c72d SHA-1: 2e70addbc2f504efcf4b11706653588de20c42ee SHA-256: b4fea8ec84002e72a55648f48c0d7dd26d77f2eeb8548f0441d47c3fadca7378
186 Risk Score

Malware Insights

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

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 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://seumenha.ru/strik?utm_term=how+much+does+supply+chain+make PDF link annotation
    • https://furimubabo.weebly.com/uploads/1/3/1/8/131856330/wugolijag-sosajitimid-javuninijo.pdfIn PDF document text
    • https://nutumavu.weebly.com/uploads/1/3/5/4/135400781/gonokeloxoviso-bopilok.pdfIn PDF document text
    • https://dibulikari.weebly.com/uploads/1/3/4/2/134235408/matitoru-rajuvobekib-zilile-zasoto.pdfIn PDF document text
    • https://cdn.sqhk.co/nexasolonit/ggIhdIR/konefuzutewopizarugemamuz.pdfIn PDF document text
    • https://cdn.sqhk.co/nanubebebot/4hg3hai/34199083321.pdfIn PDF document text
    • https://fowedejuman.weebly.com/uploads/1/3/4/5/134518602/6988239.pdfIn PDF document text
    • http://pazujiz.mygamesonline.org/14272849920.pdfIn PDF document text
    • http://mekujoviwe.mypressonline.com/definicion_de_alantoides.pdfIn PDF document text
    • https://sujabowumosof.weebly.com/uploads/1/3/1/3/131398195/gijosuwibumexaj.pdfIn PDF document text
    • https://cdn.sqhk.co/bezakebijuk/cGibDHf/ranogewolumawovepowe.pdfIn PDF document text
    • https://wosuletoxo.weebly.com/uploads/1/3/0/7/130739711/8045055.pdfIn PDF document text
    • https://novigavaze.weebly.com/uploads/1/3/0/8/130874354/fanaduvepivomanan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f568b852-d776-40fc-afde-b4c2ef929a3a.filesusr.com/ugd/2d6fb2_b5e8a0566dac4c4fbf7c0f370844ed8a.pdf?index=trueIn PDF document text
    • https://bbf05351-1c49-455c-8ea8-df349977a4d5.filesusr.com/ugd/15c6d6_082f4fd2b6e6405389ff01ab5f7d4711.pdf?index=trueIn PDF document text
    • https://9e1bd277-069e-4713-bdcc-1ab96cf790c3.filesusr.com/ugd/5fd2af_87d3579991ef46e09d3f490dab074509.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/file_manager_pro_apk_maple_media.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/8022523538.pdfIn PDF document text
    • https://f8340159-69ce-4309-ac43-521e9a8475b4.filesusr.com/ugd/bc0b97_db41dce58a8142548366cac4e50c4f42.pdf?index=trueIn PDF document text
    • http://zijiwaras.onlinewebshop.net/adverbs_exercises.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_off00013e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E59 5436 bytes
SHA-256: 839784232d31722d76539bc0d9deaea97ce5ab1cb755de9887ede121ff1c03bc
font_01_sfnt_off000150ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150CA 11456 bytes
SHA-256: 8720a173037472734a49f9ca6253e7a2750fa0d3c8f9fab7d44d6b2845160642

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