Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc821f1871c87e21…

MALICIOUS

PDF

75.9 KB Created: 2021-01-06 21:48:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: affa6bbd8916d5dbd55c094aeb2f51bc SHA-1: c6bf9c0d99fab6531e2b46d535a15e89e2b11371 SHA-256: cc821f1871c87e21be4c9517bb50d8d51123249ea74acad8af55c3b1a2fa3234
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The presence of a large number of external links, including one to 'trafffe.ru', suggests a link farm or phishing attempt. While no scripts were explicitly extracted, the PDF structure and heuristics point towards it being used to distribute malicious content or redirect users to phishing sites.

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://trafffe.ru/123?utm_term=legal+document+assistant+san+diego PDF link annotation
    • https://zuxadozi.weebly.com/uploads/1/3/4/6/134662888/pazejin-banegasutunu-lumaxatoleda.pdfIn PDF document text
    • https://solejibanumiro.weebly.com/uploads/1/3/4/4/134489880/2681a.pdfIn PDF document text
    • https://cdn.sqhk.co/revikokelobu/jeQf6ji/paypal_prepaid_apply.pdfIn PDF document text
    • https://kovumagamu.weebly.com/uploads/1/3/4/5/134578336/fc01ed303416.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/lofese/jakes_tex_mex_sheet_cake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be890b5d-bffc-4aa9-a390-aba91d207425/running_distance_tracker_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eae401d5-9ea6-43af-88ce-832e8d4f5927/wizard_of_oz_costumes_family.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/zujokoxafozat.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/jaride.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/12398032241.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/bias_and_propaganda_in_the_media.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/besame_mucho_sheet_music_violin.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/tugizonuvevaxijupug.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_off0000eaff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFF 5104 bytes
SHA-256: d5ab7e3400a73e532c93ccc6364ef48d7e8e40fd0bfb5c37ae4b8f65cc05bf10
font_01_sfnt_off0000fc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC52 11356 bytes
SHA-256: 067a38ab5eda3886d5eb6f521d448d3ab131c8482e7e3609ab9136278996785a

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