Malicious PDF — malware analysis report

Static analysis result for SHA-256 992f587635c9b6d6…

MALICIOUS

PDF

71.4 KB Created: 2021-01-03 04:40:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3dd08ee2891f90162709f3787638b62a SHA-1: b8b6bec2331d8bafadd743d5f0ab16cd67ca8a22 SHA-256: 992f587635c9b6d68ab0785c7070c1535cfaffbb581fbe946729a0785a3a4710
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 0.9998

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://trafffi.ru/aws?utm_term=lab+animal+magazine+buyers+guide PDF link annotation
    • https://ponuxarazuzega.weebly.com/uploads/1/3/5/3/135328107/jeleja.pdfIn PDF document text
    • https://rifonaro.weebly.com/uploads/1/3/4/6/134679964/7fce3f5.pdfIn PDF document text
    • https://cdn.sqhk.co/maxevurux/MhihjQ5/sikedezoporere.pdfIn PDF document text
    • https://xebadaminel.weebly.com/uploads/1/3/4/5/134523447/8826348.pdfIn PDF document text
    • https://wetolobumusu.weebly.com/uploads/1/3/4/5/134579125/9816600.pdfIn PDF document text
    • https://luragelekow.weebly.com/uploads/1/3/4/3/134377287/bodate.pdfIn PDF document text
    • https://rimalelor.weebly.com/uploads/1/3/4/8/134857757/66ae218cefb.pdfIn PDF document text
    • https://taxamoxegira.weebly.com/uploads/1/3/4/8/134895948/malufug-buxoza-laxosogimepun-lanoxijit.pdfIn PDF document text
    • https://bilezebije.weebly.com/uploads/1/3/4/3/134344171/bodafexegejopixato.pdfIn PDF document text
    • https://kesevaze.weebly.com/uploads/1/3/1/3/131383297/sifafeg-zuxebewerenuboz.pdfIn PDF document text
    • https://fixasamajiwige.weebly.com/uploads/1/3/4/3/134318971/4943260.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/eRBiahj/befazus.pdfIn PDF document text
    • https://kelurefuvaw.weebly.com/uploads/1/3/0/9/130969237/91166636f3e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fedure/67748191028.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/95658403375.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_off0000cd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4A 5068 bytes
SHA-256: 8148012a4875dbd36fa05d963dcf67cfa04156b1cc38b50612f0954bcbc2429c
font_01_sfnt_off0000de64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE64 10544 bytes
SHA-256: 2f80d96aeb9382803e8bb4191fd9d0a20e4bf135b839348148e5d762a65c636f
font_02_sfnt_off00010296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10296 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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