Malicious PDF — malware analysis report

Static analysis result for SHA-256 46f468ef4d0d4b5f…

MALICIOUS

PDF

74.0 KB Created: 2021-02-19 23:07:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 1574057b38b55789a71024690d568be8 SHA-1: 944a6fbee0ebd3a0404338e79b5358e89614b3e7 SHA-256: 46f468ef4d0d4b5f4bd020ce3ecd1b764ef72f9ac2705cd05dbd8cd6ab16934f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary external links, 'https://seumenha.ru/strik?utm_term=probability+worksheets+high+school', suggests a lure related to educational content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=probability+worksheets+high+school PDF link annotation
    • https://sakuvajavabese.weebly.com/uploads/1/3/1/3/131383602/9550381.pdfIn PDF document text
    • http://cosmosqrab.online/kebuminuruvigererejixg18m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408595/normal_601f1641ecee6.pdfIn PDF document text
    • https://pomisefinare.weebly.com/uploads/1/3/4/9/134902228/1261078.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465394/normal_5ff4c9a57adb1.pdfIn PDF document text
    • https://kefelewupu.weebly.com/uploads/1/3/4/7/134711224/rigebanowuw_xamegozek_pabowozupus_runusav.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/gonafoziguwewe/new_tamil_movies_2019_hollywood.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/2d_shapes_worksheets_5th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/textbook_of_bacteriology_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/punatipijisenogezopin.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/alaska_movie_1996.pdfIn PDF document text
    • https://s3.amazonaws.com/xapota/dieta_astringente_para_diarrea.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/lafarge_malaysia_annual_report_2014.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_off0000e31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31F 5460 bytes
SHA-256: a8081f1a920512885336a9a8031ae0ab1f2ed379effce31e15c7776d5594068b
font_01_sfnt_off0000f5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C5 10852 bytes
SHA-256: 28a2e75a17a417c31d85a77f71992b56ae91379de73c0cf51bb06d1020d9684d

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