Malicious PDF — malware analysis report

Static analysis result for SHA-256 43e8e5d9dbfe4094…

MALICIOUS

PDF

121.9 KB Created: 2020-12-31 15:17:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 31c06831c2c3e8d9ee4b3e89a5ac12a0 SHA-1: 95910ef0b0a3566644b0a383040492e06918b7a5 SHA-256: 43e8e5d9dbfe409461033f7dc872cfbe4a5df4fb2597db71221e69186187870b
164 Risk Score
Tags
free-cdn-ebook-manual-lure

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. It uses an urgency-based lure. 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 0.9998

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://trafftec.ru/strik?utm_term=go+kart+racing+suits+australia PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420612/normal_5fa0d121975d6.pdfIn PDF document text
    • https://soxajenukaru.weebly.com/uploads/1/3/0/8/130874283/fofuwumok.pdfIn PDF document text
    • https://cdn.sqhk.co/zegetaru/hgigNgf/romantic_love_letters_for_him_for_anniversary.pdfIn PDF document text
    • https://kilekawu.weebly.com/uploads/1/3/4/8/134857711/mifopogasalubetiki.pdfIn PDF document text
    • https://cdn.sqhk.co/fidumugovoz/UjdIjj2/70183876115.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377908/normal_5f8edae05158f.pdfIn PDF document text
    • https://sanuvexugivi.weebly.com/uploads/1/3/1/6/131606490/vejuli.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/bisute/calculus_1_problems_and_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/39483593856.pdfIn PDF document text
    • https://s3.amazonaws.com/jolufozo/97702785908.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/2470962669.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/pdf_to_dwg_online_convertor_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gonavo/sao_episode_6.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/4545740298.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/tuxemovajobixolibasob.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18721 5060 bytes
SHA-256: ec471c0fa52a9741c83cf562d16a3423bf7b9ff6c7426e51bce58bcd0fcfc14f
font_01_sfnt_off0001986f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1986F 13000 bytes
SHA-256: 0d8fab76a81a692650dc90c925d6dc58bd6ca6197d1d62637ea6dd061f26e63c
font_02_sfnt_off0001c473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C473 16332 bytes
SHA-256: 91c92fab729f552433758475f1ecf6a366c66c74ae6b4dd9e31a9a0100f2b42c

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