Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa92c582ce8f1880…

MALICIOUS

PDF

79.1 KB Created: 2021-03-30 06:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9641950a9f3468673488b99856bf87d SHA-1: 43a3dab2d32f1d8e9bb73e18428410456e0a18f1 SHA-256: aa92c582ce8f1880401893a47a6fc4d25c599112c7dc08ad3e9016b2851b0b0c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, with one pointing to 'http://sepinolet.epizy.com/12653912565.pdf', suggesting a link farm used for distributing malicious content or phishing. The embedded URL 'https://dafemum.ru/strik?utm_term=can+i+listen+to+music+while+riding+a+motorcycle' further supports the phishing or malware distribution vector.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=can+i+listen+to+music+while+riding+a+motorcycle
    • https://cdn.sqhk.co/resozasevej/G1idOib/44220531140.pdf
    • http://numufubigefak.iblogger.org/89383850301.pdf
    • https://cdn.sqhk.co/fuxivuxovu/vigsuWB/woodworking_designs.pdf
    • https://sawuvuvexefiz.weebly.com/uploads/1/3/5/9/135964560/kudufivaniveno-lezimojipep.pdf
    • https://cdn.sqhk.co/gitovera/fPmBifr/2pac_changes_lyrics_meaning.pdf
    • https://cdn-cms.f-static.net/uploads/4493195/normal_6042d86dba3d5.pdf
    • https://cdn-cms.f-static.net/uploads/4388827/normal_5fd7463528083.pdf
    • https://kudaxemukuwofi.weebly.com/uploads/1/3/4/6/134691428/fe3b55.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sepinolet.epizy.com/12653912565.pdf
    • https://18e7ef82-5c75-44fe-ae22-4c356c2c9ce0.filesusr.com/ugd/749e61_bfd33ca81f324097b30d4088766afe7a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3f668144-d8d4-4bbe-976c-c6d86176a477/33487011220.pdf
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_1ba74c8853144ef796826ffc9d2cb455.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f7d3dc4c-c320-466e-9a80-a51faf7392cf/how_to_journal_for_shadow_work.pdf
    • https://uploads.strikinglycdn.com/files/89e11771-d800-4b29-99f2-b32ca2b8da50/97563721713.pdf
    • https://uploads.strikinglycdn.com/files/d4eeccbf-ca15-46ad-b507-2a11f5e96638/what_can_i_do_with_a_communications_public_relations_degree.pdf
    • https://uploads.strikinglycdn.com/files/2105e620-ae83-431e-9a1e-d654bee63f2b/62997460613.pdf
    • http://gojejamajutemus.epizy.com/bali_indonesia_travel_guide.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_off0000f790.bin
332320375f8f3888ea92ef0ed66f4f85f4f466b89360c56dff6c4147c6ce2c06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF790 5452 bytes
font_01_sfnt_off000109ff.bin
2a722807971e7a6a9975428d7a445e63e79fb2f8eb3e0060f5f6b356dc718ef7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109FF 10880 bytes

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