Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6253bafb59ab0df…

MALICIOUS

PDF

74.4 KB Created: 2021-02-08 09:57:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: ddd4140ead3656b4bacd42e0195fba15 SHA-1: b6b4d8900b3d1f981ae00e75284d2b59e2e1736f SHA-256: a6253bafb59ab0dfd5e7bdab87d6ef6edb7d262a0d45ac1643802d77ffafa560
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. These links point to various domains, many of which are suspicious or known to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/aws?utm_term=university+of+michigan+in+state+tuition+guidelines PDF link annotation
    • https://cdn.sqhk.co/beratinuga/VjegfGx/momomala.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/jdhajfZ/pyramid_run_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/palazawu/hdjf5ii/bebibixixuvuxobefomufelu.pdfIn PDF document text
    • https://cdn.sqhk.co/peluxisomex/ihhdtid/gavokutuxovugizefolu.pdfIn PDF document text
    • http://yourbigdick.space/evaluation_ce1_1er_trimestrebpydx.pdfIn PDF document text
    • http://worldthailand.fun/23143279675d80kz.pdfIn PDF document text
    • http://detonic-official.website/dazobefesudibudufojajou8sj3.pdfIn PDF document text
    • https://cdn.sqhk.co/zisujidixa/h0iaXhj/sticker_maker_machine_target.pdfIn PDF document text
    • https://cdn.sqhk.co/vemetafije/ejj24gf/38642461494.pdfIn PDF document text
    • https://cdn.sqhk.co/feluxolid/hi9hbkT/xovokorofoberavizodon.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/gexgeb0/81573496935.pdfIn PDF document text
    • http://bio-ita.fun/princess_3_old_bridge_road_nelsonxi8gf.pdfIn PDF document text
    • https://cdn.sqhk.co/zifixanuk/dijjeid/asa_security_zones.pdfIn PDF document text
    • https://cdn.sqhk.co/letaziseb/jbiemZE/mobile_logo_png_download.pdfIn PDF document text
    • http://prizinsta.info/diagrama_sipoc_plantillaa3ou0.pdfIn PDF document text
    • https://kerobasoxegetun.weebly.com/uploads/1/3/4/0/134017970/6527853.pdfIn PDF document text
    • https://cdn.sqhk.co/zifuvifiweva/jacggWC/vexizexuze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE402 5588 bytes
SHA-256: eee490e268d4a1a2612aedc9eda0199fdfcfc85a12db3b2e57f4d64ae8ba9a90
font_01_sfnt_off0000f6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E8 10784 bytes
SHA-256: 47a971f7c25b93edb82d791d08cf298d6a267a4045c304c07ff7eb9074602d7c

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