Malicious PDF — malware analysis report

Static analysis result for SHA-256 6985f56d56dc829a…

MALICIOUS

PDF

65.1 KB Created: 2021-02-14 08:02:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b3fa380c0e0afc30c158a3115b0c24c0 SHA-1: d0b68a8086366dd75c3ff3163d5d10603199e822 SHA-256: 6985f56d56dc829a73d62ae29905f6a1d5aad6bba97663ef7f0476c39995a36a
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URL that redirects to a page with a keyword related to academic worksheets, suggesting a social engineering lure. The presence of PDF_URI and PDF_SEO_UTM_REDIRECTOR_LINK heuristics further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/wix?keyword=1-8+perimeter+circumference+and+area+worksheet+answer+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4462339/normal_5ffefe6592152.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393188/normal_5fe988a12c2d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466370/normal_5fff431c67a3d.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/ciahbij/wovudivuverokofofilavifi.pdfIn PDF document text
    • https://cdn.sqhk.co/rewazexi/Vr5BHW3/metal_slug_7_ds_rom_usa.pdfIn PDF document text
    • https://cdn.sqhk.co/zisuxemop/vjhgeje/fujamewubozifiriwava.pdfIn PDF document text
    • https://cdn.sqhk.co/tumupowe/Rjhehhc/tinidipu.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/kopisigapub/73521713112.pdfIn PDF document text
    • http://texigoxu.rf.gd/28727893007.pdfIn PDF document text
    • http://gimezevu.epizy.com/vevedufusawotebanumebeb.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/pifawozuraje.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

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC254 5804 bytes
SHA-256: fd8aaf3249435d84c6a20c7e940e904a16227c187ff98823d22fa4288fde1ba2
font_01_sfnt_off0000d617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD617 9868 bytes
SHA-256: 481c473480b6b0e6c0655bbe55175d28b29e4a7f26afc4bf05d6b0781090cec8

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