Malicious PDF — malware analysis report

Static analysis result for SHA-256 3958db5c4d22ef3c…

MALICIOUS

PDF

67.8 KB Created: 2021-03-04 11:48:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 820fe67c0a102c63bcdfe9437624380d SHA-1: 5abb5e7c3ae4213ccb2737e11580180159ea58fb SHA-256: 3958db5c4d22ef3c8a2b2658b5eaca8f0a4a71db042653624109c58b27e2813a
196 Risk Score

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://pelibifir.ru/award?keyword=dell+2007fp+driver+windows+7+64+bit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484383/normal_6021a81d96551.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389571/normal_5fdfbf15e722a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446379/normal_600d9d27ad5c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378404/normal_600e42f96390f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479237/normal_601da933ccade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385214/normal_5fd357960d293.pdfIn PDF document text
    • https://nagejezesalu.weebly.com/uploads/1/3/0/8/130874580/ee14031b.pdfIn PDF document text
    • https://buwipifigidorip.weebly.com/uploads/1/3/0/8/130813409/e3b71a34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423452/normal_602d7d9926f17.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379471/normal_5fee08eca42c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464735/normal_60302bd3d9133.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/dazuxujepov/bar_graph_worksheet_6th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/11737962167.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/nakovukabun.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/95478499733.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/how_to_make_mini_football_helmets.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/joferiweled.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_off0000ccb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB3 5712 bytes
SHA-256: 364dfdb30082fcc175fdf3b388cb2d1392630a6a169ea464884adf605563ca65
font_01_sfnt_off0000e05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05A 9768 bytes
SHA-256: 62818241fd711a9f0842d72e5afb682eb50dfedf24a35945e414315d78629075

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