Malicious PDF — malware analysis report

Static analysis result for SHA-256 adf51e8faf198487…

MALICIOUS

PDF

67.8 KB Created: 2021-01-16 10:51:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ff59fa9b181fe80d29aa90dabc75395f SHA-1: b4ace45c43904ac2328757767ddebe26738646e7 SHA-256: adf51e8faf19848772f647923c5d0b8840a5565325196a86c986c4e34d15c76f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one pointing to 'trafffe.ru', suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/123?utm_term=simultaneous+equations+graphically+worksheet+pdf PDF link annotation
    • https://site-1178069.mozfiles.com/files/1178069/digestive_biscuits_brands_usa.pdfIn PDF document text
    • https://tenetowebobidiv.weebly.com/uploads/1/3/4/6/134635535/zofusajobizifivaf.pdfIn PDF document text
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/75cfd0e8757.pdfIn PDF document text
    • https://vudexomitimezi.weebly.com/uploads/1/3/4/7/134717123/kevanosode.pdfIn PDF document text
    • https://site-1178836.mozfiles.com/files/1178836/milovidepijemaruru.pdfIn PDF document text
    • https://site-1178142.mozfiles.com/files/1178142/tikfans_fans_followers_likes_hearts.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/tadovu/adobe_after_effects_cc_keyboard_shortcuts.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/69973611678.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/spongebob_something_smells_full_episode.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/chip_compliance_reporting_tool.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/view_source_android_opera.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/codon_chart_worksheet.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_off0000c805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC805 6056 bytes
SHA-256: c8dd2903793ef59ce3adec206d6132cfa99320bf9e3571fb4d8159684f5efc93
font_01_sfnt_off0000dc89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC89 11016 bytes
SHA-256: 575bd9f731f5dd743f0576c35c1775c5ddb320939d7a3bda9a9ea6e6027661cc

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