Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56deb3dda3a6a1a…

MALICIOUS

PDF

75.0 KB Created: 2021-03-02 23:04:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 75d41822ea1ca5db52ebc9b4cdc8058c SHA-1: e543a07e76aac3efaf86b8be0f6f1f98a7522e9d SHA-256: c56deb3dda3a6a1a496233048910cda1eae1475e622bb422864ca87ac886ee89
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded JavaScript, though not fully detailed, likely facilitates the redirection to these external URLs, potentially for downloading further payloads or leading to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/123?utm_term=elementary+statistics+12th+edition+triola PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443362/normal_601a486d1fa72.pdfIn PDF document text
    • https://nelemiken.weebly.com/uploads/1/3/4/7/134704654/4196974.pdfIn PDF document text
    • https://fezagexagowib.weebly.com/uploads/1/3/5/3/135313062/toxipuritodelebivew.pdfIn PDF document text
    • http://nibelv.xyz/monstrous_races_dnd_5ei3yvj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419637/normal_6019dd484fdc7.pdfIn PDF document text
    • http://pshcomonhere.xyz/how_to_connect_directv_to_denon_receiver1okox.pdfIn PDF document text
    • https://valexipeval.weebly.com/uploads/1/3/0/7/130775413/53b8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392442/normal_5ff68ec3b5dc1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458618/normal_5ffdfaea3bde7.pdfIn PDF document text
    • http://thepropheticapp.com/what_is_the_fastest_defensive_driving_courseyenil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469386/normal_602ea2ea49388.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408981/normal_6035f4e2acc6b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://judewal.rf.gd/tasofubozaridajeva.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_off0000e4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D9 5420 bytes
SHA-256: a9187ab183f5d2100cf8a2861f9237cacf6de3a6026b8404972e68a12ab776f7
font_01_sfnt_off0000f722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF722 11876 bytes
SHA-256: 70344f0175bdbdc31b595fa5223145b1b68754305c030991d0488062b9a9b161

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