Malicious PDF — malware analysis report

Static analysis result for SHA-256 2abbbeddf199e2f9…

MALICIOUS

PDF

72.3 KB Created: 2020-12-22 07:40:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6d864dddf5ff911ae000ce1fab94aa41 SHA-1: 2bc5c7d6fa0aee554b867bd5cbd0371fa91c0fcb SHA-256: 2abbbeddf199e2f9935205372df1e26f26814fd559b85114f0795b6365370a89
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links pointing to other PDFs hosted on disposable domains, a common tactic for SEO manipulation or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to lead users to malicious content, potentially via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffine.ru/123?utm_term=100ml+in+ounces PDF link annotation
    • https://moxatabik.weebly.com/uploads/1/3/4/8/134885740/946227.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377678/normal_5fcd172f54681.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485442/normal_5fc9c4356e992.pdfIn PDF document text
    • https://pelusebilad.weebly.com/uploads/1/3/4/2/134234641/tawelulefi-wufewol-roraxaguf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488572/normal_5fc593a3a0f8b.pdfIn PDF document text
    • https://pobasejedewepiz.weebly.com/uploads/1/3/4/0/134017346/modisijirofoxobedi.pdfIn PDF document text
    • https://pebetojakudasud.weebly.com/uploads/1/3/4/8/134879391/simebepoperimow-newozazifogif.pdfIn PDF document text
    • https://repumuwijuruto.weebly.com/uploads/1/3/4/4/134469056/4069154.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/lowuwofuxali/twin_bed_sheets_sets.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/chikatilo_karu_chikatilo_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b7ac1ea-10ce-40b0-a264-7d530754b5ae/93582782932.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/483a85c0-6cc1-42d2-b579-d02a294097a8/vuvidedafegufevuzukosodo.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/92380769948.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_off0000dfe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE1 4736 bytes
SHA-256: 510f4bd1002982091f47dea97dc4429b6c490cc563b00e45c576a3424a5091a8
font_01_sfnt_off0000eff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF0 10652 bytes
SHA-256: ef3548a5127e19a294c72321828e0db6f3497f25a0b5de74994d7903c1e7a46b

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