Malicious PDF — malware analysis report

Static analysis result for SHA-256 358ff9daa61ff27b…

MALICIOUS

PDF

66.1 KB Created: 2020-12-24 13:11:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7e964db13f6ed1a2ee1f4dfb5106a98f SHA-1: d05fe6bb3bfea1fd64ac0f7cacf5b0e9debe68ec SHA-256: 358ff9daa61ff27bd34b2cfddd348b26d98352b85f566d82f90961623e2ec9f1
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 ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a high-confidence heuristic for an SEO redirector link pointing to 'https://trafffi.ru/aws?utm_term=ides+of+march+vehicle+sheet+music', suggesting a lure to a malicious site. No scripts were extracted, but the overall pattern points to a phishing attempt via a malicious document.

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://trafffi.ru/aws?utm_term=ides+of+march+vehicle+sheet+music PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451355/normal_5fab72ce2c027.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378151/normal_5fc9dc33291ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477637/normal_5fa661c79c19f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380405/normal_5f8acebce3fd5.pdfIn PDF document text
    • https://cdn.sqhk.co/bujavenizake/yXjcjb5/craft_warriors_mod_apk_4._2._9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376088/normal_5fdb19aea301e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372384/normal_5fc87f043db95.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/866d7365-f251-4b21-86ef-f024e134f0a0/macroeconomics_mcconnell_19th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef0f93df-6119-4901-be60-398be90ded9f/1858727705.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea3d60c7-54ee-4ee8-8856-6366209a413e/por_siempre_tuya_acapulco_capitulo_1.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/pofujesesepo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f57fc06f-db37-4cc3-b6be-d300d682cbbd/xipewulufatol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8631ded9-4026-40a3-b8fc-0593bff4f249/bipufuburita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91016e8d-e3c1-485b-8cc9-82ed3ea1d990/60958626349.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7d4fd33-43a0-4c5f-a516-0358edf19dc4/93470618263.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC270 5260 bytes
SHA-256: d4f38584657c2d4b6bf92efbc39de76ec94e1d3c62154c2f674dbeb126cb6f53
font_01_sfnt_off0000d42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42D 11700 bytes
SHA-256: d8094ad7eb1a9f95551b94fcf2f8dfadf998f9e022af4cbc859029822ecda4dd

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