Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a374743755c82d…

MALICIOUS

PDF

92.2 KB Created: 2021-01-06 18:56:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 16915b9cb85e09bf9bae3984d485490f SHA-1: 75b8a92f293265c6113e7245ab23ddc2f15d30d6 SHA-256: b9a374743755c82d34a2a558cb0213b0cdc5697e223f8fc1b8adfe9cb8072d5f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to 'traffset.ru', suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment.

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://traffset.ru/123?utm_term=i+never+sang+for+my+father+script+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448735/normal_5fa5e08a11143.pdfIn PDF document text
    • https://simiwulizolur.weebly.com/uploads/1/3/1/4/131455232/3406324.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/jadudusujuje/hp_laserjet_pro_m402dne_spec_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eadbe0f1-dfc9-4984-b605-3d960370a6c4/womomurasazoxegigadobuf.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/13435010175.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/allegory_in_animal_farm_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/frontken_corporation_berhad_annual_report_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/software_bug_reporting_tool.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6412b1d6-51ef-41db-912d-fcc94460c902/2017_ap_biology_free_response_answers_question_1.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/uniforme_colegio_san_agustin_mar_del_plata.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/arduino_due_audio_library.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_off00012bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFB 5636 bytes
SHA-256: 7d8828a78d2ddb981146fcbdc868742378f9449b0844319095059bfe53de9f6e
font_01_sfnt_off00013f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F0E 10836 bytes
SHA-256: 207222226a82bde1c10d4c4a31ca1159313576a480159679c7646de4858e4c25

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