Malicious PDF — malware analysis report

Static analysis result for SHA-256 b15b4057316a76fb…

MALICIOUS

PDF

122.2 KB Created: 2021-02-28 20:27:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a214830b380fe0f618177bdc618f98a0 SHA-1: 6160d05713089571fd19796f94b1bb9dfb4d1bf5 SHA-256: b15b4057316a76fb26aa16404d58e242d0f6672ec7953a25bbdca1407c8d9a01
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'golowaki.ru', which is likely part of a phishing or malware distribution scheme. The document body, though partially corrupted, suggests a lure related to a 'survival handbook online'. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest it's used as a delivery mechanism for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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/123?utm_term=sas+survival+handbook+online PDF link annotation
    • https://cdn.sqhk.co/dexasubu/yjcqCih/bomiwi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365555/normal_5fdea4cf061df.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/3jbLjeJ/police_cop_chase_racing_city_crime_rate.pdfIn PDF document text
    • http://lnstagramsecurity.net/bumblebee_transformer_costume_homemadep6g94.pdfIn PDF document text
    • https://cdn.sqhk.co/sanevujaguda/jSHjj7p/nabisomavimig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446782/normal_5fcb143fe172f.pdfIn PDF document text
    • https://cdn.sqhk.co/tivanosox/7aieMeE/pesara_pappu_curry_ela_cheyali.pdfIn PDF document text
    • https://cdn.sqhk.co/rekewuneboxu/LRW1mgd/89581995229.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/memobofilenabon/mexilaviji.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/90093839267.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/mufavelozuwubuxisag.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/zebidolurejisev.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/81870397915.pdfIn PDF document text
    • http://weparaxopulo.atwebpages.com/36827717538.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/josusiz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000192aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192AA 5080 bytes
SHA-256: dd985e7ce7b3897a512b1aece8964a79b3171cb6682baac79144cf43605c17e1
font_01_sfnt_off0001a3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3C9 12164 bytes
SHA-256: a64e86f70d25c121ce5df30d71668e2ae8c40bb581e91802281f8ffcf1879d92
font_02_sfnt_off0001cc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC00 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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