Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bde2ac6685cca1b…

MALICIOUS

PDF

59.1 KB Created: 2020-11-11 04:41:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 5b2f8ad92986805037a8226e3fea7fbb SHA-1: e672da51fb12603bc6cea50ed948dcef75864bfe SHA-256: 5bde2ac6685cca1ba5b1fb74f589cf7cb8be918dc6d1922b1e75dd28f55163ec
236 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with a primary focus on a URL that appears to be an SEO redirector designed for phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to academic materials, aligning with common phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://trafffe.ru/strik?keyword=mankiw+macroeconomics+answers+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390324/normal_5f8fdfd5ee675.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387224/normal_5fa0ede79bba0.pdfIn PDF document text
    • https://jawiniralegewo.weebly.com/uploads/1/3/4/4/134492986/67cde89d55d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368952/normal_5f8a516302331.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374956/normal_5f895425050b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389801/normal_5fa17cedb7d78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370785/normal_5f928ce65eec2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gomakobez/cub_scout_leader_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccebced3-74f0-4e3b-8187-9b463f2eaff8/4332032021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24e576db-37a8-4fc9-8293-564fbe02c0b4/xefuserebizanokukugova.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d65d620f-3201-47f5-b73c-4ce5a8d0a646/49196746185.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_off0000aae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAE0 5432 bytes
SHA-256: 7e168acb6835d3d346e48a2251fe669107e3a14a5f0063f6df537bd37b5b1e61
font_01_sfnt_off0000bd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD65 10132 bytes
SHA-256: 0c16be24dcdb343c9022def71553901518643196ed46f7fa67d5ffba41e4ea21

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