Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccbaaa8eb3ceef89…

MALICIOUS

PDF

72.7 KB Created: 2021-04-06 20:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b52ee7a5ff853f06bd7f956a2e5632c7 SHA-1: d1d6704cceecee5af60666c9b31576320e5df9a9 SHA-256: ccbaaa8eb3ceef89a8a3e75eaa5a3abc8741ae5644b6da7b531e006bdd909517
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a malicious intent to redirect users to potentially harmful websites. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan. The embedded URLs are the primary indicators of compromise, likely used to distribute further malicious content or phish for credentials.

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://golowaki.ru/award?keyword=axis+bold+as+love+tab+pdf
    • https://cdn-cms.f-static.net/uploads/4485826/normal_605045b4ac88e.pdf
    • https://cdn-cms.f-static.net/uploads/4381546/normal_60278bc30fc23.pdf
    • http://tebogekememesij.mygamesonline.org/brand_equity_thesis.pdf
    • https://static.s123-cdn-static.com/uploads/4375886/normal_5feb34c77e81b.pdf
    • http://serarudipiwuvon.mypressonline.com/fizebidokilafiwaxed.pdf
    • https://static.s123-cdn-static.com/uploads/4502464/normal_5fee68ff54e9f.pdf
    • https://cdn-cms.f-static.net/uploads/4415081/normal_5fd898e170894.pdf
    • https://static.s123-cdn-static.com/uploads/4492593/normal_5fe4b57d8a588.pdf
    • https://bipurubozebupal.weebly.com/uploads/1/3/6/0/136082727/vefiretokem.pdf
    • https://static.s123-cdn-static.com/uploads/4378149/normal_5ff5b5d5d7060.pdf
    • https://nakagikirowi.weebly.com/uploads/1/3/2/6/132695306/3593262.pdf
    • https://cdn-cms.f-static.net/uploads/4369631/normal_601879eaa600e.pdf
    • https://cdn-cms.f-static.net/uploads/4408875/normal_605bf3ae99daa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7ffe38df-ef78-47a1-8632-a9c579db478a.filesusr.com/ugd/8ff694_79c575bad9d6443eb21e070c3d95adf4.pdf?index=true
    • http://gozenabuzixi.onlinewebshop.net/head_first_spring_framework_download.pdf
    • https://abf133a7-37c0-4616-b653-d99fd306bce3.filesusr.com/ugd/5c8236_fe0bbf1ce26641858ecfdb04bacda030.pdf?index=true
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_d4f766505d4348e791d65effc935f30b.pdf?index=true
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_da7152f449db4f538f67dbab1056bcd7.pdf?index=true
    • http://gefuwaw.atwebpages.com/uji_parametrik_dan_non_parametrik.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_off0000de6d.bin
145fdc381fe99e2e7f67d9a57411f45e3f49cb6c0766382bc221d948fa7d41ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6D 5196 bytes
font_01_sfnt_off0000f035.bin
7adcb842a8dc724399e36f4fa990aeae15d079d40001c54972c2fa832e6cc3a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF035 10976 bytes

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