Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7cdea773337f4ba…

MALICIOUS

PDF

72.4 KB Created: 2021-02-19 23:31:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 94517905a7edb7caa7d156ecdd5cb6ee SHA-1: 3ce66cefa410e701a3bfadeda9ca34a24196b67e SHA-256: b7cdea773337f4ba9c4d5cb7ad748eafca9f670b3fba52b9a6b5d58276289f69
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-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://druttle.ru/123?utm_term=lexus+rx+350+f+sport+features PDF link annotation
    • http://differencecheats.net/jirabadanaroru2jda4.pdfIn PDF document text
    • http://winsbig.space/ice_maker_troubleshootingtp71x.pdfIn PDF document text
    • http://bopofefolinaw.22web.org/41789806186.pdfIn PDF document text
    • http://ifeelgood.club/rujavokagabuzpur1j.pdfIn PDF document text
    • http://bestpriceforukraine.xyz/ielts_speaking_part_2_questions_and_answershiy30.pdfIn PDF document text
    • http://centerverifybadge.com/charles_bukowski_poems_bookagnmg.pdfIn PDF document text
    • http://pagebake.com/hot_wheels_car_price_guideqa9no.pdfIn PDF document text
    • https://gikositaga.weebly.com/uploads/1/3/4/7/134773380/1a3ac0e0b43a3.pdfIn PDF document text
    • https://misapunuzure.weebly.com/uploads/1/3/1/6/131606411/digonawoka-giruzanajadasij-zusobopififuful-fajib.pdfIn PDF document text
    • http://tomogorman.com/13301770618fvsib.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/gozifep/balejawikuvafejub.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/55217314910.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/candy_crush_saga_mod_apk_unlimited_lives.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/lego_dc_super_villains_gold_bricks_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/vuwatozemagekaxedi.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_off0000dbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD0 5300 bytes
SHA-256: 4851f2e01f28346c514a5c4580cefb0c816b6f401950916ed1050c7356933610
font_01_sfnt_off0000edf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF1 11560 bytes
SHA-256: 2f3eb6b954edecaa7c6896646cd8678f5f5b7d6da2903fdca83e9fb1c469e699

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