Malicious PDF — malware analysis report

Static analysis result for SHA-256 39170c6f01282da6…

MALICIOUS

PDF

68.7 KB Created: 2021-01-04 20:38:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 52f0530707aa368e76536c651b738aef SHA-1: 37ab5367cb6c046bcf73088f69943a3ccf30fe6b SHA-256: 39170c6f01282da6df0ed41f6c3aa52813e07ba2d334e42d50542f0d78dcc630
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users to potentially harmful websites. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure indicate a phishing or content-distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://traffnew.ru/aws?utm_term=hide+alarm+clock+icon+android PDF link annotation
    • https://diriremipujuna.weebly.com/uploads/1/3/4/2/134265666/jixaxole_dodopabinul_pafaluporo.pdfIn PDF document text
    • https://dozexida.weebly.com/uploads/1/3/4/5/134590021/ragifobiragoz_zuranakis_vonutexipopep_norukesegal.pdfIn PDF document text
    • https://lefiletigej.weebly.com/uploads/1/3/4/5/134597596/vezib_zotilaxag.pdfIn PDF document text
    • https://zadujemerumid.weebly.com/uploads/1/3/2/6/132695269/7244000.pdfIn PDF document text
    • https://cdn.sqhk.co/puberufibo/rBjh4Sb/monster_hunter_clicker_hack_apk.pdfIn PDF document text
    • https://rovoduwomu.weebly.com/uploads/1/3/5/3/135332400/512c2.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/tezude/27091417256.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/greeting_card_maker_free_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/speed_of_trust_cards.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/18777888718.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/machinist_guild_ffxiv.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_off0000d2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AD 4932 bytes
SHA-256: efcf5d7a0c65916ce903c9ac6f4c16aa7112f2622c4782c27045f322d360c7c0
font_01_sfnt_off0000e359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE359 10240 bytes
SHA-256: 9e4dc2f419895dba278acc96f525cadfb32076abb5a13f908fda7417dd60288a

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