Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a97957b25bc022d…

MALICIOUS

PDF

66.7 KB Created: 2021-01-08 18:28:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c6ba20e32d84dfd926137722463b56c7 SHA-1: 99a0a35b9dbeb5ed77b12ccbb6fb99a721ee0fca SHA-256: 3a97957b25bc022d482b0d2f4fe9332c3a7d9caf893673aa5d43eaa518276d68
156 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 0.9999

Heuristics 5

  • 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.
  • 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://traffset.ru/wb?keyword=easy%20screen%20recorder%202018 PDF link annotation
    • https://cdn.sqhk.co/jowapezo/gfijlSf/classic_car_part_auctions_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379359/normal_5f9c7f7b7ebf0.pdfIn PDF document text
    • https://xapefawisago.weebly.com/uploads/1/3/4/7/134771693/surebiluxeg_rulidomiser.pdfIn PDF document text
    • https://cdn.sqhk.co/zisubiziwu/hgdVqhb/46148745251.pdfIn PDF document text
    • https://vugalemudapitos.weebly.com/uploads/1/3/1/1/131164275/xejimifakov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420747/normal_5fbdebee5b1d5.pdfIn PDF document text
    • https://cdn.sqhk.co/wopidevepip/IiaHpia/donkey_kong_diddy_kong_s_quest_snes_rom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464709/normal_5fe1b23c88e83.pdfIn PDF document text
    • https://goduvozimaku.weebly.com/uploads/1/3/1/3/131380582/vinoveni.pdfIn PDF document text
    • https://cdn.sqhk.co/busoleva/GVgeZ7q/junior_gentlemen_s_rollerball_pen_kits.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413473/normal_5fa04e7f98b39.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/fotepopunaj/doraemon_cartoon_new.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_off0000c8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BA 5480 bytes
SHA-256: d48928342ee30cab1496426b50b6b1ae6ccbf999a4cb1fc1b33f8a4b69acb88e
font_01_sfnt_off0000db74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB74 10268 bytes
SHA-256: fc71ffe44063e23d347e254624d9dd04515c36f9be97f0e5f7e6e2599a80f395