Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba4b716d482111b9…

MALICIOUS

PDF

70.2 KB Created: 2020-12-07 21:30:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1b9a76eba26eb29640281ed0384daabe SHA-1: e7f0fed1531b3fe46134b6ffb225cf8b07b6bc7f SHA-256: ba4b716d482111b984a40f61aa62d977b9e6bd6c9099c5fa584a6f0a56be7c2c
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 and Strikingly domains, suggesting a link farm or redirection scheme. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' indicate a phishing or malware distribution attempt disguised as a 'free-download' lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/strik?utm_term=new+testament+survey+study+guide PDF link annotation
    • https://tipefejiri.weebly.com/uploads/1/3/0/9/130969755/paxeji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366339/normal_5f870db482a11.pdfIn PDF document text
    • https://ludasajuwo.weebly.com/uploads/1/3/4/0/134096591/4712517.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417530/normal_5f9bba8639288.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391636/normal_5fab5b6d43b20.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1467d104-a016-4432-8b3e-d386efe8a6f2/37467230427.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d8b1325-430e-4a2b-944a-0f228b334233/exercices_corrigs_vitesse_moyenne_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f371682-c6a3-4f51-96bf-f3d788d516c8/63918517200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c3b4241-3cd6-40a0-b57c-949d160b5283/31316144837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18fe3f7c-ad15-4cfb-a504-ce0a478eb523/36200951697.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb624fbe-4cc5-4049-8661-568701cec8db/77829062452.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d99a1cd-210e-4973-b0d6-e86daae78ccc/nunefuruxepo.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_off0000d33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33E 5336 bytes
SHA-256: 9e3083824945316a1eee1acc3156405daa528317e2ba79dce6523c1dee1d1608
font_01_sfnt_off0000e56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56F 11556 bytes
SHA-256: 4e7076378410a9ba3a3d6c42908e1de0b373c957714823200b2a2dab12546137

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