Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0d74e9d65142f3e…

MALICIOUS

PDF

72.1 KB Created: 2021-02-02 21:42:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: bc5f497e7b221b7e97342aeb73727534 SHA-1: ed2818fdd24c1cbf8e8e144deaeaa46b0e9bd536 SHA-256: c0d74e9d65142f3e3446c1273ec1698b20b6ce9b78a28479f47732b49ba08e39
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_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users. The primary external URI points to 'https://bologen.ru/123?utm_term=old+town+guide+119+specs', which is likely part of a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and numerous external links strongly indicate a malicious purpose, likely involving the exploitation of PDF vulnerabilities or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=old+town+guide+119+specs PDF link annotation
    • https://cdn.sqhk.co/tajiwikiter/4MgcjQJ/crush_the_castle_2_unblocked_weebly.pdfIn PDF document text
    • https://cdn.sqhk.co/vifewaxupito/yhcfSii/dovoxulix.pdfIn PDF document text
    • https://posuzelivoj.weebly.com/uploads/1/3/4/8/134869480/d687d57be.pdfIn PDF document text
    • https://cdn.sqhk.co/zanotunuzi/hjjRhfp/defumi.pdfIn PDF document text
    • https://fabirakarag.weebly.com/uploads/1/3/2/7/132710689/ad23c8629.pdfIn PDF document text
    • https://cdn.sqhk.co/fetadupozo/aPhi0jf/lujoratovumatewalodisad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/papuja/68511495190.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/komplikasi_avian_influenza.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/zuzuxikujitoga.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/4242661688.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/50476043203.pdfIn PDF document text
    • https://s3.amazonaws.com/nojemi/applications_of_queue.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/pyxis_medstation_es_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/taxelatel.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/44396276619.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_off0000dc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3F 5260 bytes
SHA-256: 8372e9896c368bc149f69761483a998a8c6ff7d2ebc152f4893a081c10a89662
font_01_sfnt_off0000ee5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5A 11068 bytes
SHA-256: 2be86ea474578142079144b08e95f982c24b57ffd0d3ca47d353667e7328f621

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