Malicious PDF — malware analysis report

Static analysis result for SHA-256 b24a3e2e994fc601…

MALICIOUS

PDF

68.8 KB Created: 2020-11-18 13:47:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 3770167a124943c8e2ea70cdf91563c7 SHA-1: ae0f67beec066c8ba286a99052d4d8a8327105c4 SHA-256: b24a3e2e994fc6010543139f13f7b7ebcd5677248050fe73d756c71fc58a7335
256 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains heuristics indicating it is a credential phishing lure impersonating Instagram, directing users to a malicious redirector. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded URLs and the nature of the heuristics suggest the PDF is intended to trick users into providing login details, likely leading to account compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://lisiladojorinin.weebly.com/uploads/1/3/0/8/130874519/febufa.pdf.
  • 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://trafffe.ru/123?utm_term=elf+bowling+online+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369788/normal_5f97061c4d5af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377400/normal_5f8ce2c55637d.pdfIn PDF document text
    • https://lisiladojorinin.weebly.com/uploads/1/3/0/8/130874519/febufa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453579/normal_5fa3d75e648ac.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/setoge-dimewopupow.pdfIn PDF document text
    • https://xiwujanif.weebly.com/uploads/1/3/4/7/134705994/776088.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/wixanarer/wapagulodebasafez.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/74597203194.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/978e23dc-6c0b-4cce-8df2-2e0516681d88/borderlands_2_weapon_codes_gibbed_imgur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9934248-e72c-4649-a349-92a3633dd183/bitunovejowoxix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d2747ee-bd3d-4817-85ad-649ab02be9ef/35649963259.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb60d005-e6ee-4aa6-b267-294e71a9b5fb/st_margarets_center_lennox_ca.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/57108580109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65a16dad-e0ba-4b0f-8d83-d5fe555f72cb/39013898577.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/crb_index_data.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_off0000cf35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF35 5088 bytes
SHA-256: 9d6a71dffb4db8c3a4c9aac3adcc966461e5bdb3ebdab33d1943d58a683b3f33
font_01_sfnt_off0000e0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A8 11096 bytes
SHA-256: 74139da1cb7c2de78544036b79db0c24f6c62c6104054006aae23da7cfca470a

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