Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1237f34dcf44dc5…

MALICIOUS

PDF

67.8 KB Created: 2020-11-17 04:56:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 04bed0fe7e9dad784ad249b01163a93d SHA-1: e20193a47fd4482d1b694fa76e2731c1a8fc7676 SHA-256: d1237f34dcf44dc54f8c05f1b886a97e9faa2854156a382d75517d378a3dfae8
156 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, many pointing to Weebly domains, suggesting a link farm or phishing infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt, likely leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/123?utm_term=endless+zombie+rampage+2+how+to+use+health+packs PDF link annotation
    • https://mitigovoponezix.weebly.com/uploads/1/3/4/3/134375948/nunizikibu.pdfIn PDF document text
    • https://nipibodofabujid.weebly.com/uploads/1/3/4/2/134265940/3049822.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455195/normal_5fad2d2230402.pdfIn PDF document text
    • https://negedawitadunez.weebly.com/uploads/1/3/4/5/134587096/4384bc7d46cc707.pdfIn PDF document text
    • https://punekoba.weebly.com/uploads/1/3/4/6/134612552/9075713.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/feb3bbc8-5146-4bc1-9535-6f9839356977/73160751844.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e571a01-f66c-45b7-b1c9-f1a83d98fe82/89014107283.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70d6e07e-92bc-48d0-898a-b7814229c1ab/14616500176.pdfIn PDF document text
    • https://s3.amazonaws.com/sezutuma/66651813733.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c349f02-5717-4baa-91a1-42cd69f99ba4/grade_beam_footings.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/map_endee_owsley_county_ky_1963.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/zusijomu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32dcf055-b1a6-42ad-b48f-7d8fc76a2311/ver_la_madrastra_capitulo_117_dos.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/10401564436.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_off0000caed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAED 5920 bytes
SHA-256: 4885e2d2f4384de00a3263fb2a5aa871041c44f5b66aeffdd2cbccb208ad6091
font_01_sfnt_off0000df05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF05 10336 bytes
SHA-256: a01d0473276e5ff177d7099b961ed4de5645e13ffdae91b3e1cf55c228c4db54

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