Malicious PDF — malware analysis report

Static analysis result for SHA-256 28bda68416c6e5bc…

MALICIOUS

PDF

72.5 KB Created: 2021-01-06 11:01:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 5d5877209375702afe9e23c9d45bc278 SHA-1: 2968cd13a78e3323568acc3923925e9c6791ce63 SHA-256: 28bda68416c6e5bc442d73702c9618ff23aa3d5213e960e1cc5a239744b0119f
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO abuse for phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs and the heuristic firings for PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK confirm the attack pattern of using SEO techniques to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://trafffi.ru/aws?utm_term=genevan+psalter+sheet+music PDF link annotation
    • https://xanusikufugab.weebly.com/uploads/1/3/4/3/134371049/gelisomakipetir_jifojaxo_lotalimozalat_jojuvobupa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490274/normal_5ff2aba2dd313.pdfIn PDF document text
    • https://gajegebukorivip.weebly.com/uploads/1/3/4/4/134487765/4892857.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367633/normal_5f8c8a15aa381.pdfIn PDF document text
    • https://nuzilemuf.weebly.com/uploads/1/3/4/4/134479477/11660e90d5ef8.pdfIn PDF document text
    • https://xawuwotogot.weebly.com/uploads/1/3/2/6/132695388/9630287.pdfIn PDF document text
    • https://minebetedobipas.weebly.com/uploads/1/3/2/6/132696067/xuvum.pdfIn PDF document text
    • https://temonobulap.weebly.com/uploads/1/3/4/5/134592988/tokoruvedivoxo-livuropekokik-nipofoju-nonanowato.pdfIn PDF document text
    • https://mamexobupelo.weebly.com/uploads/1/3/1/3/131383482/jotoxinoborufew_zazaminuzir_vagaziz_wiwozomu.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/p2ji5K7/d2_football_national_championship_game_2019.pdfIn PDF document text
    • https://boxomuti.weebly.com/uploads/1/3/4/0/134016719/4b16ae.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/nerugiraxura/bavoleworezi.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/notification_reader_android_github.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/mojixugikurotip.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/79970309637.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/reluseges.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_off0000ddf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF4 5264 bytes
SHA-256: 6577dee96788df7bc0b8828cf337563d7f7e314b0a7e086c798b587d69d8ab2c
font_01_sfnt_off0000efb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB6 11196 bytes
SHA-256: da7486940f4b3377f4dc771a8863033ec2a13dc08db61f45ce0865b074731116

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