Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e5206c31e7695f6…

MALICIOUS

PDF

82.7 KB Created: 2021-05-06 00:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 97e0c571d7c9f77fd78d0bcf7e490465 SHA-1: 910e0c6ca1d9f0b51900ec37ce0bf4ac62f24305 SHA-256: 6e5206c31e7695f688e0bf1ce06d149bd940d0afe08e57f7c47c9f1c817d2974
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 0.9992

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://jacksth.ru/strik?utm_term=what+happens+at+the+end+of+the+it+book PDF link annotation
    • http://gipoletuzemixol.iblogger.org/30968110156.pdfIn PDF document text
    • http://dfwshootersupply.com/22830095120bpvmh.pdfIn PDF document text
    • https://baxinumep.weebly.com/uploads/1/3/4/3/134366260/nalolerufiguwab_karalo.pdfIn PDF document text
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/nutadawoxem.pdfIn PDF document text
    • https://gitutibilaralib.weebly.com/uploads/1/3/1/3/131384503/nolupifukap-pifarufojojaf.pdfIn PDF document text
    • http://zepawagir.iblogger.org/la_la_land_piano_sheet_music_epilogue.pdfIn PDF document text
    • https://tomadukego.weebly.com/uploads/1/3/6/0/136083679/9144577.pdfIn PDF document text
    • https://lonawojalokofa.weebly.com/uploads/1/3/1/3/131382346/1147215.pdfIn PDF document text
    • https://sozakipebi.weebly.com/uploads/1/3/0/8/130814717/740f49d58b00537.pdfIn PDF document text
    • https://disezoken.weebly.com/uploads/1/3/5/3/135327633/fidoko.pdfIn PDF document text
    • https://sorawujij.weebly.com/uploads/1/3/4/6/134671526/e8aaa69be91e.pdfIn PDF document text
    • https://xoludebule.weebly.com/uploads/1/3/4/5/134526363/luvox.pdfIn PDF document text
    • http://kittyplay.online/how_long_cuisinart_ice_cream_makerketvh.pdfIn PDF document text
    • http://trixy-matrix.space/758018162717ju29.pdfIn PDF document text
    • http://pitushok.space/how_to_make_equations_in_open_office8l92h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b615eccc-4413-4b1d-8109-ede925130a83.filesusr.com/ugd/0994f9_7abdffc32db94a7d9b153956727931d8.pdf?index=trueIn PDF document text
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_8612bcccf09c499c919f4baf57a55c7c.pdf?index=trueIn PDF document text
    • https://945c5b1a-9feb-4a08-b72d-c905ca1b1520.filesusr.com/ugd/27135d_9086dfbebe9740eda715a6e5493386f1.pdf?index=trueIn PDF document text
    • https://933527c5-e005-4225-a3aa-05fee46c7696.filesusr.com/ugd/b51dd5_f9d1f5479b8846668c01b48bc675fbc6.pdf?index=trueIn PDF document text
    • https://a22cca75-cc8f-459c-9eea-628147015b55.filesusr.com/ugd/2f8a36_083c3b14aa64493290eda402217e22f4.pdf?index=trueIn PDF document text
    • https://521a9f5b-5c7e-4f25-a9e4-5446fb1b1975.filesusr.com/ugd/c1a494_782d86ced8e644d594f71c6aa7d8ebb0.pdf?index=trueIn PDF document text
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_3762d110084b4948ad17a334adddbdd4.pdf?index=trueIn PDF document text
    • https://3dbd840c-7861-42b4-b064-af52d1d2f4eb.filesusr.com/ugd/86319b_fdd5e61ee1af4eb7a5f85f594ee01e97.pdf?index=trueIn 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_off000106c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C5 5220 bytes
SHA-256: b46b405b489a07022f3dc92c8862711ccc8fd329d9f56c5a9cb78ae01a362609
font_01_sfnt_off0001188c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188C 10796 bytes
SHA-256: db0371eb15eb505ff19aa3c9aecafc57ca7bcaadd3c0f6ab49dc9acb786bd1e4

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