Malicious PDF — malware analysis report

Static analysis result for SHA-256 56e29efe84d5c244…

MALICIOUS

PDF

80.3 KB Created: 2021-03-14 17:34:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ce2885a630df88e5024eac46c71631a SHA-1: 2eae34829eb472ff9644cb38aede9f2b8d1be951 SHA-256: 56e29efe84d5c2445c8c697b1740ef6a2665a8d4ddea5915000471b5968924ae
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The heuristic PDF_SEO_LINK_FARM indicates the presence of a large number of external links, with one prominent URL being https://nipisod.ru/123?utm_term=balsamiq+mockups+3.+5.+16. This suggests the document is designed to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://nipisod.ru/123?utm_term=balsamiq+mockups+3.+5.+16
    • http://axecheat6.xyz/38599671074ynpmn.pdf
    • https://static.s123-cdn-static.com/uploads/4369781/normal_5fcabe65154a9.pdf
    • https://vesedosaripiwuj.weebly.com/uploads/1/3/1/6/131636692/xuwimokefasopof.pdf
    • https://cdn-cms.f-static.net/uploads/4414352/normal_601598456b423.pdf
    • https://cdn-cms.f-static.net/uploads/4403119/normal_60232ed64ceaf.pdf
    • https://cdn-cms.f-static.net/uploads/4401538/normal_603bddaf2a34f.pdf
    • https://vidiwubiref.weebly.com/uploads/1/3/0/8/130874646/2f888.pdf
    • http://idealslimitalia-official.site/kolb_learning_style_inventory_free_onlineq37p4.pdf
    • https://cdn-cms.f-static.net/uploads/4410956/normal_6032d602bb67e.pdf
    • https://kanapajuzusuma.weebly.com/uploads/1/3/4/5/134589940/9603959.pdf
    • http://govugododuwo.iblogger.org/46147685709.pdf
    • https://cdn-cms.f-static.net/uploads/4457604/normal_6021eda6a1d4f.pdf
    • https://static.s123-cdn-static.com/uploads/4455375/normal_5ffb86549da47.pdf
    • https://mifurujuxix.weebly.com/uploads/1/3/3/9/133997148/7836221.pdf
    • http://org-fruit.space/what_are_good_exercises_to_lose_belly_fatja3ry.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_2843e8a4c69d40349bcc563038f08786.pdf?index=true
    • http://bonilevugebenu.epizy.com/vevanojabiwetodagev.pdf
    • https://2c9641c8-5874-4869-9b94-f1378e60aa6b.filesusr.com/ugd/efc1f6_99184e1669f54a21abf6d799881f0cc6.pdf?index=true
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_8ab58cebc3fc49f78b3e2a1b51884740.pdf?index=true
    • 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_off0000ee8e.bin
82f5131a596a0826e48d185184fafafab9fd1c5ca0a9f67b80b513027f36d841		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8E 5748 bytes
font_01_sfnt_off00010223.bin
9c842660b9d08db283d94284f58c09041ceddce985de1b29eeaaf8b3cd465702		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10223 15948 bytes

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