Malicious PDF — malware analysis report

Static analysis result for SHA-256 56c97e5dfb38634a…

MALICIOUS

PDF

72.8 KB Created: 2020-11-14 20:21:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16b0c8e61444c1e8b483ddff520b2dcc SHA-1: e4e24e4bc6b53f2a88ae5b49781e24d6d0a9a64c SHA-256: 56c97e5dfb38634a6c3f56b3647e866b59387d73586584a25e56056e9b955ea1
214 Risk Score

Malware Insights

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

This PDF file exhibits malicious characteristics, including a critical heuristic firing for linking to known malicious redirector infrastructure. It also contains a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier further support its malicious nature, indicating it is likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://cctraff.ru/aws?utm_term=embedded+figures+questions+and+answers
    • https://jiwozipepogi.weebly.com/uploads/1/3/4/4/134462700/gosuf-pumitolifek-jadetutopazuk.pdf
    • https://cdn-cms.f-static.net/uploads/4393370/normal_5fa5537ae1f66.pdf
    • https://xujaxivef.weebly.com/uploads/1/3/1/4/131438557/vabikadapetota_dajeseni.pdf
    • https://cdn-cms.f-static.net/uploads/4412902/normal_5f9d3151a5adb.pdf
    • https://kexoxuneve.weebly.com/uploads/1/3/4/5/134501441/jowurekavoloni.pdf
    • https://xoxujodega.weebly.com/uploads/1/3/4/3/134363828/niwukikulobarax.pdf
    • https://cdn-cms.f-static.net/uploads/4393502/normal_5f8fba83443f1.pdf
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/1696278.pdf
    • https://folemazilepi.weebly.com/uploads/1/3/1/1/131164248/diles_ledetoxuxaxin_gipug_sadenimikumizi.pdf
    • https://xazebuwojij.weebly.com/uploads/1/3/4/4/134467588/tajufajixodo.pdf
    • https://cdn-cms.f-static.net/uploads/4408004/normal_5f92dd7f271f8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/44748d16-8489-4943-b361-b159d4711c4a/tamazapitejewekumuga.pdf
    • https://uploads.strikinglycdn.com/files/02aea411-9bb2-4e73-ae3f-68c0cb15fbfa/zolofeb.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_off0000dea4.bin
f69449a16124b38269617f16bda9bd82214513841e677e4f3a9562abd806339f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA4 5512 bytes
font_01_sfnt_off0000f153.bin
5d122b0c6e6af4a791d05095aa268110ce918fb3f5896c325f6f8a832500647d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF153 10916 bytes

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