Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c90a6a10ce3a289…

MALICIOUS

PDF

75.2 KB Created: 2021-01-19 08:38:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: ac31655e7bc045c83a72120764f59771 SHA-1: 0d7396891b4a0ba221730fcd874f2fc5a88f402c SHA-256: 8c90a6a10ce3a2896210d3daf594776e500b8000418cdb4195c906c49f178341
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 of which are part of an SEO link farm, and one is identified as an SEO redirector. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or spam distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to malicious websites.

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://leonvi.ru/123?utm_term=victory+games+pacific+war PDF link annotation
    • https://cdn.sqhk.co/masamiwe/gcibgdX/best_music_player_app_for_android_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501777/normal_5fe10b5a9d568.pdfIn PDF document text
    • https://site-1177370.mozfiles.com/files/1177370/graphing_logarithmic_functions_worksheet_rpdp_answers.pdfIn PDF document text
    • https://nolipugi.weebly.com/uploads/1/3/4/6/134652161/a7cd59a56f00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426810/normal_5fd160a21ed27.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366662/normal_5fe2f36e410f7.pdfIn PDF document text
    • https://cdn.sqhk.co/rularijulen/ijtzjaq/jejiriverunapew.pdfIn PDF document text
    • https://cdn.sqhk.co/xiselaza/XERjghb/free_live_wallpapers_to_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379369/normal_600030af04410.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383572/normal_5fc62d3e68c4b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417319/normal_5fc5ba0f883d3.pdfIn PDF document text
    • https://sewigidafison.weebly.com/uploads/1/3/5/3/135316790/tadukerukexijos-selalebemote-zikobib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375077/normal_5f949e60bcb01.pdfIn PDF document text
    • https://site-1167953.mozfiles.com/files/1167953/62680700149.pdfIn PDF document text
    • https://dedelazixuni.weebly.com/uploads/1/3/4/5/134596723/wonibitunos-zugiwofeti-muzaguvonipav-tajobavodemas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378153/normal_5f9db0e39945d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gejevebo.epizy.com/30193394142.pdfIn PDF document text
    • http://zenejifawulo.epizy.com/munadupujix.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_off0000e73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73E 5464 bytes
SHA-256: 148ea9e03727ddc13ea4d37fef719824b47c6b2938af402aa6b289feee240738
font_01_sfnt_off0000f9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E1 11060 bytes
SHA-256: 92d19857617e2882e656f438ca19108b47b8dd896da89248815aed4fb75090a5

Open this report in the interactive analyzer, or submit your own file for analysis.