Malicious PDF — malware analysis report

Static analysis result for SHA-256 a498a7fa674986dd…

MALICIOUS

PDF

62.7 KB Created: 2020-12-19 17:40:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7dcd2e72b4197498cfef4f7f655d0084 SHA-1: c4c00a58cccd1ae95bfb178eaca2cb973e2a7666 SHA-256: a498a7fa674986ddbd4e42ffa6c419e79c04b7ae183b9b883fc2c3fef0676373
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 redirectors, and is flagged by heuristics as an SEO link farm and a free-download phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffnew.ru/strik?utm_term=lewis+structure+no2cl PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374953/normal_5fa87f9b2db9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370278/normal_5f9c522615edc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452834/normal_5faf50c2ccde0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385417/normal_5f9c7e6094253.pdfIn PDF document text
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/685507.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383917/normal_5fb5f907da05c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387232/normal_5f91253bcdab9.pdfIn PDF document text
    • https://mujolimu.weebly.com/uploads/1/3/4/8/134868529/difuxaxufigif.pdfIn PDF document text
    • https://mipurilor.weebly.com/uploads/1/3/1/0/131071035/wowusenub.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/c2aebfc3-02f7-49fc-9ddb-6a3077881291/gugevixegepijufekapukulok.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dac460f2895dc1e79d89/t/5fc1028efa04221c71437374/1606484624744/allstate_vehicle_service_contract_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7201da0d-0987-4ae1-a4de-09a38da64efa/kixamozosiwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb862aff-d066-41dc-b948-9480f9b38530/hometown_boys_wrestling_league.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1697783c-146f-4406-991d-af658b0ebebf/neuroanatomy_made_ridiculously_simple.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 7

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_off0000ba70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA70 4748 bytes
SHA-256: fda7ca3cf34ac95bbc955ab690ef5ab5cd5a65a70301332c78294e9d90973f0d
font_01_sfnt_off0000cac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC2 10440 bytes
SHA-256: d1101351b1a2af564e8b922201752eb933027250a763bbf9c71b80dd1938b9d8

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