Malicious PDF — malware analysis report

Static analysis result for SHA-256 858a80b0ac9b8b7b…

MALICIOUS

PDF

74.5 KB Created: 2021-03-25 07:53:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: eef9826fa89e2ef66880a17069537cda SHA-1: 5b7354d75ad27769f883fa990bfec6e8f82a1c8e SHA-256: 858a80b0ac9b8b7b0aadf22304045ec6ced5bd9b7387dc0088003df966c4cd39
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous external URIs, with a primary one pointing to 'midufefew.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying the PDF as a link farm on disposable hosting, designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/wix?keyword=tundra+location+map PDF link annotation
    • http://degimogug.mypressonline.com/ferevamebelomef.pdfIn PDF document text
    • http://siwosupegejolop.medianewsonline.com/77766266218.pdfIn PDF document text
    • http://tirudibemaj.22web.org/kualitas_sumber_daya_manusia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371814/normal_601432bcd70c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391335/normal_604dcee356ba6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485710/normal_6026b1c22ced2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417429/normal_5ff1fa321ed0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500183/normal_5fd68ae6db768.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jisiwolug.rf.gd/8609307639.pdfIn PDF document text
    • http://redemezalunilor.rf.gd/chuyn_hnh_nh_t_sang_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d03d6db-3540-4073-a52e-845325a0a33f/korogomotirixaniz.pdfIn PDF document text
    • http://refusunono.onlinewebshop.net/49385263567.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/bazozeke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/321792aa-a904-4d30-9704-ef9fe3334198/tobojuvadaze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7452381-afdb-45c6-bc97-0627d41ace02/22711192480.pdfIn PDF document text
    • http://rolubumemetujin.atwebpages.com/fokawowimo.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/does_ps5_have_backwards_compatibility.pdfIn PDF document text
    • http://magufabag.rf.gd/98373646795.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/dance_songs_bollywood_latest.pdfIn PDF document text
    • http://kotuwelu.rf.gd/69086781554.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_off0000e4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FE 4988 bytes
SHA-256: a395d62baabf146a0618a91294c2cb7acd077b98c3845415074f28ab1839250f
font_01_sfnt_off0000f5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DC 11824 bytes
SHA-256: bd4918bee77703a27109b6fbc8510280df74b47d511b559acbc3a237dc2bc08d

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