Malicious PDF — malware analysis report

Static analysis result for SHA-256 b52d791ddca591f8…

MALICIOUS

PDF

81.3 KB Created: 2021-05-03 18:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: ac7ab9986cebb819c6bc5b9e08a99d2d SHA-1: ecec3dbbc22850078d54dd7ff7c7cfc56fc09e84 SHA-256: b52d791ddca591f83103d052ff1fb5cfc3b250acc4817ddc271cf9173e65ec6e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were extracted, the PDF structure and embedded URLs point towards a phishing or redirection scheme, likely intended to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dugedepap.ru/strik?utm_term=aramaic+english+new+testament+roth PDF link annotation
    • https://jozitosada.weebly.com/uploads/1/3/4/3/134325699/588c280.pdfIn PDF document text
    • http://sisedema.22web.org/android_studio_kotlin_tutorial_for_beginners.pdfIn PDF document text
    • https://fivugolukebil.weebly.com/uploads/1/3/4/9/134902908/6961658.pdfIn PDF document text
    • http://kexedeziferu.sportsontheweb.net/amla_plantation_project_report.pdfIn PDF document text
    • https://pevusipifo.weebly.com/uploads/1/3/4/8/134863194/kekudijusowiru.pdfIn PDF document text
    • http://zewegirugiputix.22web.org/kijexibena.pdfIn PDF document text
    • https://zikazofikadit.weebly.com/uploads/1/3/0/7/130739129/jepimita.pdfIn PDF document text
    • https://xitititoludazo.weebly.com/uploads/1/3/5/9/135987602/folule.pdfIn PDF document text
    • http://beduzevitugok.mypressonline.com/fepuzolalozokefonudugo.pdfIn PDF document text
    • https://voromelub.weebly.com/uploads/1/3/4/8/134872571/lamede.pdfIn PDF document text
    • http://wutanumijejol.sportsontheweb.net/importance_of_interest_groups.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wakerot.epizy.com/tilikute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21a2ecd9-bd15-4091-b911-33d8efbf67e3/ariens_snowblower_compact_24_review.pdfIn PDF document text
    • http://bubaxomunuf.rf.gd/muvax.pdfIn PDF document text
    • https://6c639bf1-704a-4500-b661-329758898742.filesusr.com/ugd/02d620_1a088d8829a849aca6aaffc869503c9f.pdf?index=trueIn PDF document text
    • http://wiroweri.rf.gd/taco_bell_power_menu_bowl_veggie_calories.pdfIn PDF document text
    • https://331e17ce-4321-42a7-89aa-067eaa3daeeb.filesusr.com/ugd/6576ad_4beeadcbea8b4a96b642f30a6efe83c6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/27cba52b-73ca-4c79-be1c-6823d3eafcd3/vidixileposeluzus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cec75f6-d3b4-490f-ba24-619c096ddf8c/god_of_carnage_alan_monologue.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_off0000ffe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE2 5292 bytes
SHA-256: 98efd70024a47162d2433a178a6d30b8e62838a578c700f2e35c11844bbfb245
font_01_sfnt_off000111c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C4 10648 bytes
SHA-256: 8581d19fbcc422fc6676c63a534d210f9e16280e738b684ea64b5bf6481ec351

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