Malicious PDF — malware analysis report

Static analysis result for SHA-256 631b402be67cd10c…

MALICIOUS

PDF

75.7 KB Created: 2021-05-07 05:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a02a696210aa59c321a4802ec62fb1bc SHA-1: e0b77d4bc1031d5f1ce7a31fe32f6c4ce705add7 SHA-256: 631b402be67cd10c6629bd953b51d0c7142138ee754640bf5936c6cb0b994e52
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as legitimate content such as interview preparation or reading exercises. The primary malicious URL identified is 'https://lozipotod.ru/strik?utm_term=how+to+answer+interview+questions+for+police+officers', which is likely used to host a phishing or malware payload. The presence of numerous links and the ML classifier's high confidence score indicate a phishing or malicious content distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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.
  • 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://lozipotod.ru/strik?utm_term=how+to+answer+interview+questions+for+police+officers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426972/normal_605c8d883f551.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367627/normal_5fd77bf12cfe3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412170/normal_60272aebc8295.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489733/normal_5feb0e7279cb3.pdfIn PDF document text
    • http://tazizaj.iblogger.org/ximewowegapirufap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451350/normal_605ca1a7f132b.pdfIn PDF document text
    • http://wazojox.iblogger.org/ai_deep_learning_and_machine_learning_a_primer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lunurubu.rf.gd/reading_exercises_for_esl_students.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/mumikamabamatobodugaliku.pdfIn PDF document text
    • https://200c4c3d-185b-4246-b99f-f40cd7065c99.filesusr.com/ugd/3ed902_9e7897cc2bdc42d8bc8980a3112cec8a.pdf?index=trueIn PDF document text
    • http://vofoxefubi.epizy.com/gulimazadok.pdfIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_8aa14793dab7425ea01dd3000d721daf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ragejufa/29482728991.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/korixolixegoputu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a80e27b-3421-413f-a85c-cdae4ffd3d79/60275231670.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/jalinogewobem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53d62e04-f683-46bc-b6d0-c4544a6360f0/likuwuxefaverebub.pdfIn PDF document text
    • https://91313464-3f42-441e-b0e8-b27065d471ad.filesusr.com/ugd/ee9d3f_cc7075a897454109bf1012c4b3d4b9e3.pdf?index=trueIn PDF document text
    • https://1f571a09-6495-4108-bd1a-9715deae29b5.filesusr.com/ugd/b0bf26_62f83425b79740fd902d06aed037c93e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dekogamik/z83_application_form_word_format.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/vobotev.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE4 5248 bytes
SHA-256: 40315f47c616862d761e4e270aba2f1ac42b22eb721cb5e58272e88012c0c3fb
font_01_sfnt_off0000fdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEE 10636 bytes
SHA-256: 424e6dcc44235eba6f58f1767d4193112340a57c46c1e349fc615f23bb1f8e96

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