Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef3d0740f8ab6e8…

MALICIOUS

PDF

63.7 KB Created: 2020-11-28 06:24:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 57f7c62d6a9cb4bfdcb53a526061488d SHA-1: 7aabb78059cdce3793a73141eb63b9dac46a371b SHA-256: 9ef3d0740f8ab6e8bf55adf0921ee6fa64963a229362ddc02533502ab893ddf9
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics point towards a social engineering attack designed to redirect users to malicious sites.

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://traffset.ru/123?utm_term=ice+cream+birthday+party+invitations PDF link annotation
    • https://waxatuvew.weebly.com/uploads/1/3/4/3/134371429/fenakena_rowoderitedom_wadupe_gifukidibobitam.pdfIn PDF document text
    • https://gedamalemomomig.weebly.com/uploads/1/3/4/5/134504316/a53d1bb3.pdfIn PDF document text
    • https://bijuxoku.weebly.com/uploads/1/3/4/9/134901677/63dfa9b4b2b6f5.pdfIn PDF document text
    • https://jorosovepi.weebly.com/uploads/1/3/4/7/134706332/854358.pdfIn PDF document text
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/6391395.pdfIn PDF document text
    • https://rimofemosi.weebly.com/uploads/1/3/4/3/134351632/764497.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/df4ead33-631e-478b-855c-792adbac86e4/89193725636.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb105989-37a9-4ab4-b4ae-7ebeaa2b5be9/fast_and_furious_7_720p_dual_audio_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ddd6fa5-21ec-4d01-af13-74dad776e9f6/finite_mathematics_12th_edition_gold.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99382d34-484d-402f-8455-635eec9daff2/78430680548.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/41207061057.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3dfebe9-279f-4e80-9b7c-a505d3bb7614/92902902553.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d664a75-f54f-498e-9f6b-d7358a97db47/luciferian_witchcraft_book_of_the_serpent_michael_ford.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_off0000bb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB2A 5520 bytes
SHA-256: 9fa215441848d030de67ba138506e5d841de6375e5588b2364a19f950b1defca
font_01_sfnt_off0000cdc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC4 10848 bytes
SHA-256: af50bd9fc360d3548e4e68140bf2782a87778151b5b6b31abac016c199e4e6e9

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