Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c16f684f3b09587…

MALICIOUS

PDF

57.8 KB Created: 2020-11-11 01:20:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 13bb442e1d0d2ff9a140f59efe14c56c SHA-1: ea7331b42a760b329309c9719ce89f42d88cd312 SHA-256: 7c16f684f3b0958724dd323a277bc2060d499e71cd5fb48f92ac16a3405b90ff
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document flagged as malicious by ClamAV and an ML classifier. It contains an embedded URI that functions as an SEO redirector, likely for phishing purposes, as indicated by the 'free-download phishing' heuristic. The document body is heavily obfuscated, but the presence of external links suggests an attempt to lure the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/aws?keyword=bostitch+model+sb-1850bn+manual PDF link annotation
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/radorudezipaxorobewe.pdfIn PDF document text
    • https://kofukupapakube.weebly.com/uploads/1/3/4/5/134586312/7fa20.pdfIn PDF document text
    • https://kedumapeba.weebly.com/uploads/1/3/4/5/134593926/11ab7f2e5a39.pdfIn PDF document text
    • https://wekegakusujesal.weebly.com/uploads/1/3/4/2/134266445/f322766.pdfIn PDF document text
    • https://bujupovira.weebly.com/uploads/1/3/4/4/134472582/e0dee405ead17.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/1647bc59-94e6-40ef-a479-3ed47e69e379/cisco_packet_tracer_1.2.4.5_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68746aa5-a027-4a7d-8b4a-6515694a59a1/xedesinevarewogupoboside.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bea2f6fa-1086-493a-967d-bd1159a18b90/bosch_error_e24.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3e9bb68-1845-4016-89e4-dab76cb61c8a/neketepajupi.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_off0000a6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA6B1 5816 bytes
SHA-256: cd7c4fea476f5da37131996e0d7eabe41716100784b2806028db8fa4bcf38d4e
font_01_sfnt_off0000ba5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA5E 9544 bytes
SHA-256: 6b012a9c53f829922a7eb7738c8b0f3926a9b46392989eec08937488e5a20dce

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