Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b2426960ebe6ba…

MALICIOUS

PDF

68.0 KB Created: 2020-12-19 08:29:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7ed54d1f7f690038656a0c11d3fbaa66 SHA-1: e17297d0d54ac3fb6e452447db66865aa8c28d70 SHA-256: b9b2426960ebe6ba6a8f3f38b814d4a2b0c13ad78290b90801564b0a430ac359
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many of which point to SEO redirectors designed to lure users to malicious sites, such as the primary observed URL 'https://traffset.ru/strik?utm_term=my+brilliant+friend+pdf'. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the presence of numerous external links strongly suggests a phishing or malicious redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/strik?utm_term=my+brilliant+friend+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4391907/normal_5fcedda9a5124.pdfIn PDF document text
    • https://josafobuwevaj.weebly.com/uploads/1/3/4/4/134464642/dovakajuwugopiz.pdfIn PDF document text
    • https://bapoxaluw.weebly.com/uploads/1/3/4/7/134717037/28f697e4a29d40.pdfIn PDF document text
    • https://susokeruno.weebly.com/uploads/1/3/4/6/134656617/5ee43253b6324.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381536/normal_5f942455ee0c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367273/normal_5f98ea9f6d105.pdfIn PDF document text
    • https://zesawomu.weebly.com/uploads/1/3/4/3/134321331/wujoneb-zanum-jebutevu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472484/normal_5fbc190fc4a5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366358/normal_5f890cdd5b934.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470964/normal_5fa3a8b2edd7e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc582dfc30a162e0c71c6b6/t/5fcb70dcbce7087d1add2741/1607168221056/small_fold_up_wall_desk.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 8

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_off0000cd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD49 5104 bytes
SHA-256: 16b82ad41db4638af737d801545a949b5e94f958368d35c19c108b4ee8da8dd9
font_01_sfnt_off0000dec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC5 10844 bytes
SHA-256: a0099528805083c48783b2d7b95057295741e787b990c23054fd8196e3a0d7c3

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