Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bef5c4c48fb368d…

MALICIOUS

PDF

63.9 KB Created: 2020-12-18 17:18:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d573450f9b2bcaa7b3219fb40cdeef2a SHA-1: b4b8d2dbe501b53d2fc85b8352bf2dfcc701b2c5 SHA-256: 3bef5c4c48fb368d62daaac7372204e96de1c5b05a7615ac215391fd25f75c06
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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/strik?utm_term=geometry+section+5.1+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385204/normal_5fa2dc4e3c9dc.pdfIn PDF document text
    • https://vomefamatufovo.weebly.com/uploads/1/3/4/3/134378522/nikomudove.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485149/normal_5fc4bacce311f.pdfIn PDF document text
    • https://gorigopaf.weebly.com/uploads/1/3/4/3/134341526/vudajisizakagokikapa.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/7da32175-85b3-4753-bb8a-2d5865ef5c1e/jemorafinivabeguxe.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/psychology_questions_and_answers_in_telugu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc512d3ff13940aa25a72a5/t/5fcd752e05ddc9599d3709db/1607300403666/vintage_cruiser_bike_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9eec033-e3e9-4240-b697-c67de689002c/zigigabasasurarikuji.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/washington_dc_vacation_planning_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/zejamebumirexereb.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/fulisoninube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf09456d-0851-457a-a50f-52da7e3409d6/zulewugukur.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/kiganefekalebarapotogax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f7fc151-68b0-481a-b51a-e24c341da3b0/14860158526.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/norstar_phone_manual_m7324.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b15704ac-2e56-414c-99d6-79b2522b5f0c/luperinu.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_off0000bd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD1C 5504 bytes
SHA-256: f41ee3ee8bfc771b2e111715eed25c764db9931bd6831aba40b926b18360c4af
font_01_sfnt_off0000cfd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD6 10120 bytes
SHA-256: d577abb793ab3e4a505a7b6829e37ef9f35752baab1f86e59f231a2fd42ba5fd

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