Malicious PDF — malware analysis report

Static analysis result for SHA-256 03df77a2c4b74d38…

MALICIOUS

PDF

84.6 KB Created: 2021-05-21 01:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 91faef329400b73b94d2fa2c45f3a624 SHA-1: 7ee6781bc4302031e89f8c4075fd53afa7c1236e SHA-256: 03df77a2c4b74d380a7944254ba373e635890cad832cdc485ee987c60bab8e67
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF link farm'. One of the primary external links, 'https://baarspo.ru/strik?utm_term=frases+para+introduccion', is flagged as unknown reputation and is likely the intended destination for the user. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/strik?utm_term=frases+para+introduccion PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479688/normal_6011830d62ecf.pdfIn PDF document text
    • https://zusamazoboxo.weebly.com/uploads/1/3/4/5/134527389/pomelef_loxefixarojegu_kesedisirised.pdfIn PDF document text
    • https://nazumuliwoj.weebly.com/uploads/1/3/1/3/131383416/mevanapepevub-paroparil-nolaxilirunefom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421208/normal_605034a4f2a73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446511/normal_603927a2dcb6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464871/normal_600f10a08bc1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370542/normal_60131343c3595.pdfIn PDF document text
    • https://gedepaxu.weebly.com/uploads/1/3/1/3/131378821/2014909.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d539fd57-5291-44ea-b1f9-73f2b7a7967f/snap_on_digital_torque_wrench_1_2_drive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22f737f0-1473-44e2-916d-12bc81f011a9/25595357097.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/high_pointe_microwave_oven.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/variables_in_psychology.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/titabi.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/68977178513.pdfIn PDF document text
    • https://s3.amazonaws.com/dexodekelaseki/49891676592.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/badger_5-_81_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/tifegunutuvamedeboxal.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/coin_collecting_guide_quarters.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/telifive.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/47149777813.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/customer_enquiry_email_template.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF493 4992 bytes
SHA-256: 885475d9edc849316a96a6618c1aa4a5f191b5585410c76653c31c7c057d6c56
font_01_sfnt_off00010597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10597 12992 bytes
SHA-256: 79a49468e059b903f867b8c304802a6d83c6fce564b86716557fdb47bc1ecf3c
font_02_sfnt_off00012e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E64 16168 bytes
SHA-256: 794d8cc090a449e0d460036171b2d5b2c749cb0dc3f17972c44626ada68ee3d8

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