Malicious PDF — malware analysis report

Static analysis result for SHA-256 11470592e66a7c31…

MALICIOUS

PDF

72.1 KB Created: 2020-11-16 21:51:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b7b2e9993ac4bf664ad63d3ed6d9e6ad SHA-1: dfdd764ce1ff6b620e249669cc3bfed7089e5816 SHA-256: 11470592e66a7c31f70bcd00d946e54e4c123153f790c8f87a194b06b30f5e38
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 0.9997

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://trafficel.ru/123?utm_term=6-4+skills+practice+rectangles+answers PDF link annotation
    • https://xefosujusiro.weebly.com/uploads/1/3/4/0/134042031/7ba69.pdfIn PDF document text
    • https://kepigepejabuji.weebly.com/uploads/1/3/4/3/134315220/winakewij_mijivanujilo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366302/normal_5fabb8195a74a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/baba8ab4-e3eb-4ec2-b4af-bc259d82838f/86835831694.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82de0d1c-1f1a-4137-8de2-3e161682f403/nuletafezevaxej.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/9973732645.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/90604672641.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d47e072-c948-43ee-8f84-fee51479a5c8/dragon_ball_super_dubbed_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b0caf13-79d1-44ec-b6ca-62d059761ee4/zorich_mathematical_analysis_amazon.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/film_benedetta_follia_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/pikeville_high_school_football_locker_room.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_off0000dc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC19 5436 bytes
SHA-256: b765c50db6f3aeb53715e8e7631ed279c1b412431f6d6c85547803380aa15e38
font_01_sfnt_off0000eec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC9 10744 bytes
SHA-256: a66dcac18c4c2571683c1754f7d29602ce9e04bd40370be38c47348e14fb65a9