Malicious PDF — malware analysis report

Static analysis result for SHA-256 886f6f5d41aaf951…

MALICIOUS

PDF

63.4 KB Created: 2020-11-16 12:24:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 56954074e2608215296d743087b38708 SHA-1: 58266b5194c047c7a7d4ed8b4301f7e941c303c1 SHA-256: 886f6f5d41aaf951cdfb38a054242b92414d382511670b05a5f1f7874b657798
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a prominent one pointing to 'trafffe.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, strongly suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the nature of the embedded URLs and the ML classifier's high confidence score point towards malicious intent, likely to redirect users to malicious sites.

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 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://trafffe.ru/123?utm_term=rune+frame+of+power+remove PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385634/normal_5f93839b61e90.pdfIn PDF document text
    • https://sepenunaxob.weebly.com/uploads/1/3/0/7/130776074/jojepuv.pdfIn PDF document text
    • https://xawaviwuxuj.weebly.com/uploads/1/3/4/2/134235980/58a36f99.pdfIn PDF document text
    • https://lakujasoramaw.weebly.com/uploads/1/3/4/4/134400634/titilazejezesilo.pdfIn PDF document text
    • https://tagojakiwuki.weebly.com/uploads/1/3/4/4/134444274/de073.pdfIn PDF document text
    • https://razezoxuwen.weebly.com/uploads/1/3/1/4/131453099/5336667.pdfIn PDF document text
    • https://galavalo.weebly.com/uploads/1/3/4/4/134464717/3780881.pdfIn PDF document text
    • https://jinugavov.weebly.com/uploads/1/3/4/4/134438703/1395731.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/vixuwogetiv/vimitasajutuzizutupobag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab00596b-4978-486a-9b2e-d3c790c97d05/61471092572.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7460ea2-0162-423d-bc57-01482abc0e97/71935795584.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/word_whizzle_names_from_the_old_testament.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e2a542c-d1c7-48e0-a3c1-6e131bd0a6e9/dutikoronopegov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d206b7ee-dec8-4b7e-a784-36c3d61f5a21/91218983031.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9d5ee09-06d2-4666-8bbb-afc51b8d0397/12119957605.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04a393fd-268f-4e18-895a-8ebe8506e562/bajawinakudajogodomemoke.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_off0000befc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEFC 4996 bytes
SHA-256: de9ec0a98d0849e6770bc075521157f199c23b46d363f6d7bbd7990a1e95e6d8
font_01_sfnt_off0000d002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD002 9576 bytes
SHA-256: 61fcaab423341f7ef8639459b04632a08be0f304d6fe5eaac08a4c96dae93e70

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