Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1d13fafb0c3fd29…

MALICIOUS

PDF

75.6 KB Created: 2021-02-15 19:48:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2ea85270340fecf70f76e0d105a50811 SHA-1: d5449151f6b6c7fd745e25d13e75f1529a1744bc SHA-256: e1d13fafb0c3fd29d6cdadc9ae96042beab5a726de85669fbfc0bec1db68d842
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, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

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://leonvi.ru/strik?utm_term=vox+ac30cc2+mods PDF link annotation
    • https://kasikijafeke.weebly.com/uploads/1/3/1/4/131406722/2949773.pdfIn PDF document text
    • https://vavuloxen.weebly.com/uploads/1/3/0/7/130738497/753f8b81d6b6e.pdfIn PDF document text
    • http://trickyturkey.com/android_file_transfer_not_working_note_10o574d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412160/normal_5fd18ff1c6681.pdfIn PDF document text
    • http://paypallsecurity.com/together_with_english_language_and_literature_class_10_solutions1hblz.pdfIn PDF document text
    • https://fipamowusaki.weebly.com/uploads/1/3/4/8/134879766/rikubegad.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxonavi/ifiiRie/98618814964.pdfIn PDF document text
    • http://dehydratedoriginalgoodness.com/713283003548v114.pdfIn PDF document text
    • https://tafubevodila.weebly.com/uploads/1/3/4/0/134016741/pomozowipiz-zipuruj-satajebisipibo.pdfIn PDF document text
    • http://ionatr.space/22484189487fnpis.pdfIn PDF document text
    • http://formblckr1.xyz/16270689836zc66.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/bulozor/nilareditej.pdfIn PDF document text
    • https://s3.amazonaws.com/zubata/toyota_camry_2018_android_auto.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/dutugubemili.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/fahrenheit_451_part_1_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/24467288099.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/simple_present_exercises_esl.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_off0000e799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE799 5428 bytes
SHA-256: 13d3e320c65e3b0bc929e069e0355bec584044374ae9c38a17b82d6387978d55
font_01_sfnt_off0000fa03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA03 11664 bytes
SHA-256: 687653e8e3467626c04d7b3d880fa00ea7dbeb81a0c21a7a39d369f7beb2591b

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