Malicious PDF — malware analysis report

Static analysis result for SHA-256 438a1013a9922c7a…

MALICIOUS

PDF

75.8 KB Created: 2020-12-28 09:16:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2808a3663fa9bf572df944f9b46f1903 SHA-1: a64078c1e813cf281b1b9761f6654df54697cdc8 SHA-256: 438a1013a9922c7a336243af1e5797d6dfeefbc33fef04c13dbfbfac966906a3
194 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and detected as malicious by ClamAV. It contains numerous external links, with one pointing to a URL that appears to be a redirector for a phishing or malware campaign. The presence of a 'download button' lure further supports a malicious intent to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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?utm_term=ea+sports+ufc+4+update+4.+02
    • https://cdn-cms.f-static.net/uploads/4410004/normal_5fdb5b92d0d62.pdf
    • https://najijufo.weebly.com/uploads/1/3/4/7/134714833/vawegosejujufufivol.pdf
    • https://redunexodozik.weebly.com/uploads/1/3/0/8/130814050/zeminemedubad.pdf
    • https://tatunonomufobuf.weebly.com/uploads/1/3/4/3/134355176/bizemosilixiwalanev.pdf
    • https://robiduvasolowa.weebly.com/uploads/1/3/4/6/134657162/vepuwekaduvodiropaf.pdf
    • https://medizagokitoni.weebly.com/uploads/1/3/2/3/132303310/5330896.pdf
    • https://gepumisi.weebly.com/uploads/1/3/4/5/134517510/bbe34e.pdf
    • https://puxonuge.weebly.com/uploads/1/3/1/3/131383548/1d98359f957.pdf
    • https://xalemewo.weebly.com/uploads/1/3/4/6/134665704/2333380.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/98f9f311-c98d-4b86-a434-3eac8d2717df/sci_fi_planets_3d_model_element.pdf
    • https://s3.amazonaws.com/bikikanafopavu/48049466512.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaf7.bin
0843094ae61b50f5d3f93123d6df0fb0f6ce34898cea02a35687ce75680e75aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF7 5468 bytes
font_01_sfnt_off0000fdb1.bin
712f48e5808ff61e5eaae886a25116549ddf6cab256b9c9b965ef7f9ada1ce8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB1 10304 bytes

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