Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfa08a2ded718b81…

MALICIOUS

PDF

98.2 KB Created: 2021-02-24 20:13:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: ea751643e8db13321ad6ec03625ade1d SHA-1: 9d5ff74ff51dffed36dc5a84a7084708d4efa311 SHA-256: dfa08a2ded718b812b24f18fddd6129168252a3800b95f733d12f8a64c498de5
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 pointing to Weebly-hosted PDFs, suggesting a link farm or SEO poisoning tactic. The presence of a critical ClamAV detection and ML classifier flagging indicates malicious intent. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, but the primary malicious activity appears to be the redirection to external URLs like 'https://baarspo.ru/award?keyword=how+to+play+old+game+of+life', likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://baarspo.ru/award?keyword=how+to+play+old+game+of+life PDF link annotation
    • https://teputire.weebly.com/uploads/1/3/0/8/130813428/zexubemap.pdfIn PDF document text
    • https://vidafipi.weebly.com/uploads/1/3/1/6/131636743/6248698.pdfIn PDF document text
    • https://futilupotozuvat.weebly.com/uploads/1/3/1/4/131454482/nopidit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485801/normal_600b0b4841ab1.pdfIn PDF document text
    • http://rexevivejegox.scienceontheweb.net/wanebukisub.pdfIn PDF document text
    • https://buwupejobo.weebly.com/uploads/1/3/4/2/134265589/bogizuwu_zoleziz_junozoj.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/97490499446.pdfIn PDF document text
    • https://forerijekakifur.weebly.com/uploads/1/3/5/4/135401119/8550c1e5ef447dd.pdfIn PDF document text
    • https://gagakulusete.weebly.com/uploads/1/3/5/3/135326625/276184.pdfIn PDF document text
    • http://sevagawos.getenjoyment.net/jibebikupetazakazuko.pdfIn PDF document text
    • https://jovonawokemurif.weebly.com/uploads/1/3/4/6/134678447/6612942.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/wupagivoz/automatic_call_recorder_pro_apk_latest_version.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/34365163618.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/transfer_foil_sheets_for_nails.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/44045280937.pdfIn PDF document text
    • http://vidugozu.atwebpages.com/84378973134.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/james_hardie_scyon_axon_cladding_installation_guide.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AC6 5240 bytes
SHA-256: fa0a79a86310c1d58cfe8991750d5471315606d7f09918d1650e5800343637dd
font_01_sfnt_off00015cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CAC 10672 bytes
SHA-256: a4eda6e767a58a14d191cbeb30615fb850d70d3995d7c74a6a4feebda46ed532

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