Malicious PDF — malware analysis report

Static analysis result for SHA-256 be8140cb04844218…

MALICIOUS

PDF

98.7 KB Created: 2020-11-10 07:54:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 46b30cc4bc824794f57a7e4ae0e79fe2 SHA-1: d233cfd963fd64c55fc617b93dc505646b9a15bb SHA-256: be8140cb04844218bcabdae1e3a07a2da747c0fc0ca14a9b6d6799442ba2c128
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs point towards a social engineering attack.

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://trafficel.ru/strik?keyword=on+the+road+by+jack+kerouac+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422385/normal_5fa5bbaa7ecd9.pdfIn PDF document text
    • https://bulipabuwalo.weebly.com/uploads/1/3/4/1/134131868/mosaz_bukonimi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367919/normal_5f9cbd96ca050.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367951/normal_5f8899ac5cafc.pdfIn PDF document text
    • https://sujexixapobitu.weebly.com/uploads/1/3/4/3/134328704/jubigeratakotogegud.pdfIn PDF document text
    • https://kipakewetug.weebly.com/uploads/1/3/4/6/134606983/8245069.pdfIn PDF document text
    • https://bitekiparoduj.weebly.com/uploads/1/3/4/0/134017536/2894002.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375083/normal_5f8d3ba595bd4.pdfIn PDF document text
    • https://takotowi.weebly.com/uploads/1/3/4/3/134356266/1687aa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/dc90d94d-49cb-4fd4-876c-4d641ac27867/binavisenage.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/astrology_books_in_marathi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d02df839-c87f-4a2f-8295-27c88884c6b7/bomifojavilepifisale.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/investigating_biology_lab_manual_8th.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001359e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1359E 5276 bytes
SHA-256: 791a939f3a1f6211f516a464f4cff515dbeb2b69410ddf044ed04124554a809d
font_01_sfnt_off0001478e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1478E 12072 bytes
SHA-256: 76e5bc5a2e964bb05f1e5dc3c0b8e47edeedda11ea71e6df41c45b8fe649a6a8
font_02_sfnt_off00016f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F92 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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