Malicious PDF — malware analysis report

Static analysis result for SHA-256 70309c40c4ddf99e…

MALICIOUS

PDF

101.6 KB Created: 2021-01-10 00:16:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 0eae9a369492d30ca75432abb3974126 SHA-1: 543760dff88c9d2f1e7bb305da58615d4f26bb01 SHA-256: 70309c40c4ddf99e1da37b44a02598afef6cbd6e2ff76df5bfe7b4489bba6295
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files hosted on disposable domains or services like Weebly and Mozfiles. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafficel.ru/aws?utm_term=autoformation+windev+17 PDF link annotation
    • https://warakamaluxib.weebly.com/uploads/1/3/4/3/134378328/filorojul.pdfIn PDF document text
    • https://site-1171599.mozfiles.com/files/1171599/55983848294.pdfIn PDF document text
    • https://setopotuvojinow.weebly.com/uploads/1/3/4/8/134877086/5289542.pdfIn PDF document text
    • https://kifirazet.weebly.com/uploads/1/3/4/7/134715796/rupadufafibez.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/e9ff54.pdfIn PDF document text
    • https://site-1168377.mozfiles.com/files/1168377/19359885549.pdfIn PDF document text
    • https://niwurakoj.weebly.com/uploads/1/3/4/5/134588258/2357736.pdfIn PDF document text
    • https://nejufolij.weebly.com/uploads/1/3/4/8/134883139/069869.pdfIn PDF document text
    • https://site-1178662.mozfiles.com/files/1178662/turbo_card_apple_pay.pdfIn PDF document text
    • https://site-1166749.mozfiles.com/files/1166749/super_car_racing_multiplayer_mod_apk_unlimited_money.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/geraromu/27707300757.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_off0001441e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1441E 5000 bytes
SHA-256: 9f83c99debab7225262ecfb96d61ca47a068321a7bd799a0af50310b97672e20
font_01_sfnt_off00015522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15522 11352 bytes
SHA-256: daf6982f3be2721d666f2ee663b721720f813e0e9b4fa1c792883de04a5aeb5a
font_02_sfnt_off00017b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B87 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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