Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b9761cfe3cdfff4…

MALICIOUS

PDF

71.1 KB Created: 2021-02-20 03:41:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: ba454e83807a4fb53b46655247ac10b6 SHA-1: 152a87ace41c90139b2b9c5df3fc0bc88d97ee6d SHA-256: 0b9761cfe3cdfff440560e489df0f9677c741382b85e45df1538124814c0e3c5
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many of which point to SEO redirectors designed to phish users or deliver malware. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links, and the 'PDF_SEO_UTM_REDIRECTOR_LINK' specifically flags an image lure leading to a redirector. The ClamAV detection and ML classifier also strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/123?utm_term=indiana+university+plagiarism+test+answers+reddit PDF link annotation
    • https://wonulabanasilod.weebly.com/uploads/1/3/1/4/131482851/1636761.pdfIn PDF document text
    • https://fexifeter.weebly.com/uploads/1/3/4/6/134612515/3221580.pdfIn PDF document text
    • https://kowepesabileb.weebly.com/uploads/1/3/4/6/134635017/toguluxe-bewekowadaker.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446646/normal_5fe2e5119d3ab.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/JUQFhfz/3441378072.pdfIn PDF document text
    • https://cdn.sqhk.co/nogawevorus/ihiejhz/76274607540.pdfIn PDF document text
    • https://cdn.sqhk.co/sepokafaru/g6rIhcI/star_flyer_swing_ride_orlando.pdfIn PDF document text
    • https://batigagonu.weebly.com/uploads/1/3/4/7/134774980/vitoj.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/zumezeviwakiz/rizimirisep.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/janaboxatekonex.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/46791728535.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/98382638414.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/sozasutaserafedidowefem.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/adobe_scan_ocr_android.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/rawir.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_off0000da1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1A 5468 bytes
SHA-256: 5ae48ebb63651eebafd45ea47b428666814690fee4d318f3ef6b23471ff4b533
font_01_sfnt_off0000ecbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBC 10068 bytes
SHA-256: c44fc757312df0f643b8478112940ffdc9e9f6e3a84b277a32bf67972968c7e9

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