Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ed431f378b626cf…

MALICIOUS

PDF

78.3 KB Created: 2020-11-21 12:28:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 0e4d2563d4e45aedbf47c891e0a1f5e7 SHA-1: 116edb29c51db920ccfba25ae357c4590b3d9b62 SHA-256: 2ed431f378b626cf026e9e3ed0ad0efaa21e1414b54a332d89b15ef89610a66d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/123?utm_term=hosa+dental+terminology PDF link annotation
    • https://defugelunek.weebly.com/uploads/1/3/4/5/134524545/fumalafuwugavijupa.pdfIn PDF document text
    • https://midepixa.weebly.com/uploads/1/3/4/6/134622545/5b230.pdfIn PDF document text
    • https://jibametugo.weebly.com/uploads/1/3/4/4/134486067/e70f5.pdfIn PDF document text
    • https://ditiwudo.weebly.com/uploads/1/3/1/4/131452947/8456019.pdfIn PDF document text
    • https://gokajafiwewafij.weebly.com/uploads/1/3/4/3/134314986/1e43d.pdfIn PDF document text
    • https://sisodiwitamusoz.weebly.com/uploads/1/3/2/6/132681746/kesavemed-podexesabij-dufixogefagaje.pdfIn PDF document text
    • https://gejovekozeja.weebly.com/uploads/1/3/4/4/134401956/pobelulalurokimiwum.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/a59aaaa9-d541-402e-94f2-72c1a99929b4/47299099011.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/adobe_photoshop_cs3_serial_number_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cdad311-fe66-4ea5-949d-6309aed27802/zinuzimometek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30b950f8-002d-4186-85b9-8fee21c67c6c/9004440002.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06531fb6-a0c3-48c0-9ee6-99ee47fdd13e/16166426897.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63f418f3-f97d-4a74-9151-9ff27d162ff5/ridgid_tile_saw_guide.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_off0000f68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68D 5208 bytes
SHA-256: 8996812464acaa67d66f5d18985ce61895ae62912df0885f2e60f4f83b08f29b
font_01_sfnt_off00010830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10830 10760 bytes
SHA-256: 65a9d474e3877dcc26857b7caa54b67df71b0c5b9989893bae951bb1057a523e

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