Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c71e7487cb37568…

MALICIOUS

PDF

87.4 KB Created: 2021-03-01 00:35:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 9b4d2b34e768de1cec9d703931e798d8 SHA-1: 0d9391755d52bd06c013682a4aa3dd45f0aea4dc SHA-256: 8c71e7487cb37568c1ad252437293d50ccc0ac021c2f12f91f63f34b657640ce
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are hosted on disposable domains, suggesting a link farm designed to distribute malicious content. The primary URL, 'https://maypoin.ru/strik?utm_term=asus+wireless+router+rt-n12hp+setup', is presented as a setup guide but likely leads to a phishing or malware site. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://maypoin.ru/strik?utm_term=asus+wireless+router+rt-n12hp+setup PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381297/normal_601334e1667f8.pdfIn PDF document text
    • https://fovubimosifiwu.weebly.com/uploads/1/3/4/3/134324820/musezetunuw-bosazobukanun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374207/normal_5ff693f61040b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451221/normal_5fcd8d7727451.pdfIn PDF document text
    • https://cdn.sqhk.co/niwexifa/gPIhdhj/misfit_26_diy_drift_trike_frame_kit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423453/normal_602340282623d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413862/normal_5fe0f51ed742b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_600da16e7f8c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447434/normal_60163a522eb35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422918/normal_600a11cb5a6f9.pdfIn PDF document text
    • http://tisigetid.iblogger.org/mamadunelupetibefavol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422373/normal_5ffd9abc3557c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rupiroliwon.epizy.com/54093332030.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/aptis_practice_book.pdfIn PDF document text
    • http://gazusoketa.epizy.com/airdrop_for_pc.pdfIn PDF document text
    • http://mezifaxura.rf.gd/79883381915.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_off00011b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2E 4992 bytes
SHA-256: 2cd5b29ae556d74315f882e9ae2fad3d8dfd40cab2fefacc843c40297de1991a
font_01_sfnt_off00012c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C44 10624 bytes
SHA-256: 3ec8c1ba7f3ac8458b06f5058d0e442b405099034be363f4421319facbc51f07

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