Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a57ab651c94cef…

MALICIOUS

PDF

87.1 KB Created: 2021-03-04 09:02:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: cfde586851ab22b5e7bdd18d689e79e2 SHA-1: 5834201dfa42a59458bf2bc3e7f15f2132c2d594 SHA-256: 42a57ab651c94cef8008f63fab6a6aa34d085416050f0699e0f31f165c912323
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xajibur.ru/award?keyword=capital+markets+institutions+and+instruments+pdf+free+download PDF link annotation
    • https://simokenuma.weebly.com/uploads/1/3/5/3/135311421/pomigawapegojo_demabogawo_zomile_kimotuba.pdfIn PDF document text
    • https://cdn.sqhk.co/gazegarov/tijifhf/lego_police_car_and_robber.pdfIn PDF document text
    • https://wavoxodasamemat.weebly.com/uploads/1/3/5/3/135348105/mabofofepafe-tukavewule-tozepozodogi-nikegum.pdfIn PDF document text
    • https://cdn.sqhk.co/lejukujegomi/jVdhdhf/coloring_and_learn_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419633/normal_602cf803634cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447467/normal_6037151a22ada.pdfIn PDF document text
    • https://riluvozig.weebly.com/uploads/1/3/4/3/134380056/09d55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415519/normal_603ab9b4d62cc.pdfIn PDF document text
    • https://cdn.sqhk.co/jepivitixiwo/ieSZieD/nedugikuwadirupamekusig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411919/normal_6020cde4ee09c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404740/normal_5fecae3b737fd.pdfIn PDF document text
    • https://sejumajofejopib.weebly.com/uploads/1/3/2/7/132740214/99d28.pdfIn PDF document text
    • https://cdn.sqhk.co/kisesawaropo/JIbgehb/waratah_star_picket_caps.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/bevekizadoxuj/axe_head_template.pdfIn PDF document text
    • http://kovawasokagi.epizy.com/workbench_plans_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/84331632339.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_off00011792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11792 5248 bytes
SHA-256: f47fca52ca6e7ffda09a201106869f670ab757fad921234a5966640431fbb351
font_01_sfnt_off00012963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12963 10880 bytes
SHA-256: 1315b12f8186d8bea7c14e7c54f07fd76a7fe0b743336aa3e0b8c6f0b9a92a00

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