Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd421cf05c48b31d…

MALICIOUS

PDF

71.0 KB Created: 2021-02-13 12:13:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: f6d35afa29f3a8bee4b120e504592294 SHA-1: 48fe90a11e27b506dab2d9c29e08b88ae1e7cf33 SHA-256: cd421cf05c48b31d34d9f8fee313b7e36ad70ec30317bc2cb162699ab58a751c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a significant number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier output of 0.999766 indicates a high probability of maliciousness.

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://maypoin.ru/aws?utm_term=showbox+android+review PDF link annotation
    • http://korsabarca.com/raimon_samso_gratis23nx3.pdfIn PDF document text
    • http://salonvarna.com/world_cup_soccer_2019_bracketra056.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486197/normal_60146875c2eab.pdfIn PDF document text
    • http://xaninivinekeni.iblogger.org/abp_news_live_tv.pdfIn PDF document text
    • https://vipukawolatu.weebly.com/uploads/1/3/4/4/134486161/99bf0.pdfIn PDF document text
    • https://maparezoja.weebly.com/uploads/1/3/5/3/135321508/kuxofovad_bupodilo_rurafisuwanu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453754/normal_5fd6d9f7425dc.pdfIn PDF document text
    • https://zubisixoligifi.weebly.com/uploads/1/3/4/4/134479514/f2f86ec3c.pdfIn PDF document text
    • https://vubenazago.weebly.com/uploads/1/3/4/3/134357699/8a37b272e2.pdfIn PDF document text
    • https://dexulana.weebly.com/uploads/1/3/4/2/134234773/punomewugusesex_satigutomexufi_folafaxitipi.pdfIn PDF document text
    • http://hookup757.fun/anime_guitar_games_apk_downloadevzu9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452199/normal_5ff9fdf755a7e.pdfIn PDF document text
    • https://xuxukiworizep.weebly.com/uploads/1/3/4/7/134723333/koguletawiru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448550/normal_6019bdd81f6fc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mibofive.epizy.com/condom_size_guide_inches.pdfIn PDF document text
    • http://govatojajij.epizy.com/baxodofanonejotanevazi.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_off0000d953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD953 5168 bytes
SHA-256: 900aadb2cc66800420e72b07db75e5a4f99a2adafb2cf2497ecccf6bf66831e8
font_01_sfnt_off0000eaf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF7 10708 bytes
SHA-256: cedbea44878502b751227233e039848119822aa3b3eb5994d5ff5ef7e0d9f4a4

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