Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57a124b5531e444…

MALICIOUS

PDF

84.6 KB Created: 2021-02-11 14:41:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: df0a86906d6aa8035963230b0ea002da SHA-1: d25f8d32761c9ee17a85c66acbc4a9e1c178fe99 SHA-256: a57a124b5531e444fe181021fd59c55c9349d5b12c6a0f372612de1be23782b7
186 Risk Score

Malware Insights

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

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=lina+maria+acevedo+el+cartel+de+los+sapos PDF link annotation
    • https://xulomonixibeneg.weebly.com/uploads/1/3/1/4/131455416/2081607.pdfIn PDF document text
    • https://cdn.sqhk.co/noxuluni/aKfEQPS/fefidiwutaniximenuku.pdfIn PDF document text
    • https://ketokaxuvora.weebly.com/uploads/1/3/1/8/131856042/xibemekoxigokurena.pdfIn PDF document text
    • https://bokakuvuzojoji.weebly.com/uploads/1/3/4/3/134351808/4fd85.pdfIn PDF document text
    • https://davabodijesofid.weebly.com/uploads/1/3/4/4/134474123/vurexitix-mabazagudina-lilunerazor-zugepofuwupa.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/eYvjg0B/stachys_palustris_seeds.pdfIn PDF document text
    • https://cdn.sqhk.co/bobimugura/Rjap3hb/danapulotuvu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470231/normal_600ecb1d366bd.pdfIn PDF document text
    • https://piwevowukitibe.weebly.com/uploads/1/3/1/4/131454699/wexiwameja.pdfIn PDF document text
    • https://cdn.sqhk.co/linotepibubi/hhggcgc/adrien_calls_marinette_princess_fanfiction.pdfIn PDF document text
    • http://bowuxog.iblogger.org/pumpkin_carving_template_dog_face.pdfIn PDF document text
    • https://jiwejezagaxu.weebly.com/uploads/1/3/5/3/135325467/desinedi-rikoxinivojixef-gixodakugewi-tibovetisole.pdfIn PDF document text
    • https://daguvosiliwu.weebly.com/uploads/1/3/1/4/131406153/kuluvagut.pdfIn PDF document text
    • http://loleveze.iblogger.org/13536643759.pdfIn PDF document text
    • https://legobunisazej.weebly.com/uploads/1/3/4/5/134501617/vumovul_lesutiro_kuguvo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dupula/tigubokisafafejepux.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9F 5220 bytes
SHA-256: a77c99feb2cba844abcad6965462f1d4dda352b40211271c9cb0f96fd7a30321
font_01_sfnt_off0001114b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114B 2484 bytes
SHA-256: 3957183e8ce92d98792d4d932155d0057f4773d25fcb72ecf8e2056c5eb9c99e
font_02_sfnt_off00011bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF0 11920 bytes
SHA-256: c1a2d9aaae33dad4ce31e662d18d56327297d63e9a694eef052ef704c2c6771f

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