Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a2a381a62e1c6f…

MALICIOUS

PDF

76.2 KB Created: 2020-12-07 07:54:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f9a3de923321a27d4c7ffb05bfc9e004 SHA-1: 7dcf973cc69a154d139079ad53e1006eda60f9b1 SHA-256: a6a2a381a62e1c6f821cc4cb461f34df73243febefdd22c1be59173869e7b1c8
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of PDF_ACROFORM_BUTTON and PDF_URI heuristics suggests interactive elements that could trigger malicious actions, potentially involving embedded JavaScript.

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.
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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/123?utm_term=vietnam+war+jungle+conditions PDF link annotation
    • https://gikigafe.weebly.com/uploads/1/3/4/4/134440869/wovepaborisex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383147/normal_5f936dd7affd4.pdfIn PDF document text
    • https://dasibovuripuxub.weebly.com/uploads/1/3/4/8/134860981/ed66107972f69.pdfIn PDF document text
    • https://numeroluxovuz.weebly.com/uploads/1/3/4/7/134733954/tixisow-nurufasi-juwuwaluro-dagarituxetorum.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/dafalebinoza/narrative_paragraph_defined.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2da458139af037651e5bd/t/5fc5424e5147b14804de80a8/1606763089179/munchie_mania_answers_level_26.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90b3fc88-7f4d-4e3e-8b65-1c4c1a272fb6/fosikelorafa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/443be670-69b5-4441-b090-d9deed21a58e/favujinelifujofegadeg.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe17f9f8cdb769c6ab696c/1606293497798/la_paz_weather_in_december.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/42336348199.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9405379c-11fa-4b56-a9d6-c2565d16a966/backyard_baseball_torrent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cf01c28-b9f9-4238-961b-0292d9d36649/kenshi_bounties_go_away.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_off0000ee07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE07 5392 bytes
SHA-256: 8f5584dd951970dfac570ee11b032bd395a20a81e64318be3075bb6b104ab619
font_01_sfnt_off0001005b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005B 10472 bytes
SHA-256: 3d0b19fd40a05e748e15e809bd33bf75339911e9ccfc4abd3fbd975fbceabb0d

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