Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dbd8775f2dced95…

MALICIOUS

PDF

70.6 KB Created: 2020-12-11 11:24:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 9ed0eafd9cabf85ea1157ec2532dbd1e SHA-1: 1d1de008b4cf9ba8d97904536f4023e2cc65089c SHA-256: 8dbd8775f2dced951c2b7ebe144add1a8f22c0f6c556fe729b1b8c5edd4be11c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. One of these links, 'https://trafffi.ru/123?utm_term=craigslist+houston+bikes', is directly embedded and likely serves as a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF.

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://trafffi.ru/123?utm_term=craigslist+houston+bikes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366008/normal_5fa1422acb836.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411917/normal_5faf28c862f5f.pdfIn PDF document text
    • https://radutarogo.weebly.com/uploads/1/3/4/3/134379411/wutigulunedivike.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410016/normal_5f95daf84fbf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381536/normal_5f9cdcf476bd5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0d6c88787e879896ba956/t/5fc96f469901aa382b3619af/1607036746540/15452609559.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc67f67ab79f442f2500a09/t/5fc7b759efc65c5b7a4d2e1d/1606924121732/cthulhu_virtual_pet_how_to_level_up.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc79a43c89b935f15e314ea/t/5fce890f568e9314cc15d220/1607371023778/microsoft_teams_download_for_windows_free.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc30859ab79f442f23780a8/t/5fcb0ab833fb14715cb4e33d/1607142073075/belibupit.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5045d2e537a05ef237332/t/5fc92ad4608c63731998382a/1607019221429/kapijowonubinevowasa.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4d6412cf09257bd84e6cd/t/5fd181eead61ab5831825109/1607565808525/magukofa.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/50495478958.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_off0000d5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F6 5056 bytes
SHA-256: 1d397f6bdffd303807fcbcd36fcd008227af07039b413e5296041b500fc564e8
font_01_sfnt_off0000e717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE717 11264 bytes
SHA-256: 19303e6edb00ac4777497aa4113a18c479b222f1b0c75f0c72a2c4491609f2d7

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