Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fdbff250f46984c…

MALICIOUS

PDF

69.6 KB Created: 2021-01-11 16:50:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 183ce67ebb8be93c729acac5a4167ee2 SHA-1: ebe9deae3ab98599f2faa024adb798d751165871 SHA-256: 7fdbff250f46984cfb15b9be284263d81de80b99231056638cd530bd600b52af
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with a critical heuristic firing for a 'PDF_SEO_LINK_FARM'. The primary external URL points to a domain associated with a link farm, suggesting the document's purpose is to redirect users to a network of other PDFs. While no scripts were explicitly extracted, the presence of numerous external links and the ML classifier's high confidence indicate a malicious intent, likely for SEO manipulation or distributing further malware.

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://trafftec.ru/aws?utm_term=bulats+practice+exercises+pdf PDF link annotation
    • https://tusatetop.weebly.com/uploads/1/3/1/4/131408029/96d390117e35c.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/hhjfxhi/3412852540.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/igjgZ7Y/wallpapers_for_iphone_x_4k.pdfIn PDF document text
    • https://mafexanilexa.weebly.com/uploads/1/3/0/7/130739060/magupozidet.pdfIn PDF document text
    • https://cdn.sqhk.co/xedufoga/oaRjhhb/venture_capitalist_definition_simple.pdfIn PDF document text
    • https://cdn.sqhk.co/pefatipi/gghh7j8/my_talking_ginger_3.pdfIn PDF document text
    • https://cdn.sqhk.co/xejoxoka/6fc4EmX/polynesia_adventure_game.pdfIn PDF document text
    • https://cdn.sqhk.co/semiwewedazi/VjiV9gh/zeduzupibevi.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/senodiw/barney_almond_butter_nutrition_information.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/31106947968.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/zevutunugesiwipadaf.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/musasuvavomazovizod.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/9186005197.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/process_improvement_flowchart_template.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/azhar_video_song_tinyjuke.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_off0000d412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD412 5264 bytes
SHA-256: ba6009a024b571b24d31502677d0c1d3bfa275d69cc9692e7b932ee9d7611a9a
font_01_sfnt_off0000e60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60E 10316 bytes
SHA-256: 86cb5089f2e77b2edc3b4de5e2e72f47d0076b7437d06b02eca00bd194f0e7bf

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