Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb526c96ef1a7d8d…

MALICIOUS

PDF

76.5 KB Created: 2021-06-08 20:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f044faefdade3a8eaf95f47a081e1242 SHA-1: 5cf96ee2aeaebce99beb21c89a27521565eb5fac SHA-256: bb526c96ef1a7d8da9048b9c4158c6c457836606e2e3ada2149d289cc901d8f3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/pbw?utm_term=diamond+song+download+mp3 PDF link annotation
    • https://gepajalubawif.weebly.com/uploads/1/3/5/3/135326746/785aec2825.pdfIn PDF document text
    • https://logutidukikov.weebly.com/uploads/1/3/1/3/131380383/5079c1e314.pdfIn PDF document text
    • https://buparemekixa.weebly.com/uploads/1/3/0/7/130739227/taganudarakegejisore.pdfIn PDF document text
    • https://mogeletonedilo.weebly.com/uploads/1/3/1/4/131482944/5083242.pdfIn PDF document text
    • https://jatasurow.weebly.com/uploads/1/3/4/3/134358583/tujefemuzagefezowe.pdfIn PDF document text
    • https://sikalejewop.weebly.com/uploads/1/3/5/3/135341852/merar_melegazopavob_nakotaziraferut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xuruzinijub.pbworks.com/f/gta_san_andreas_indir_pc_windows_10.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/f/how_to_write_bank_request_letter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/328134ae-04cd-43c1-bf44-7992bbdefc64/mirotefisesipuku.pdfIn PDF document text
    • http://wiliser.pbworks.com/w/file/fetch/144569799/kaxigamudalefi.pdfIn PDF document text
    • http://zobifel.pbworks.com/w/file/fetch/144650028/best_trivia_questions_and_answers_2020.pdfIn PDF document text
    • http://rubuxesi.pbworks.com/w/file/fetch/144839028/55495234186.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d9d32fa-93a1-4df8-ab71-4c3b57bfc101/xejobunufasavonudif.pdfIn PDF document text
    • http://wizepexu.pbworks.com/f/how_to_use_bluestacks_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc6b7eb9-1779-4dac-9154-f44091c5e841/best_workout_program_for_gaining_muscle_mass.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69b986d4-7b77-49e4-8de0-a79bb799f776/samsung_sdr-5100n_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b576e864-6e96-4fd4-acf1-c37dcb09536f/xaluginutirok.pdfIn PDF document text
    • http://bopelijexuf.pbworks.com/f/wetowezorimabijojebezeji.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE104 5028 bytes
SHA-256: e79be0161dd53ec592363b0b588171dbe342b2eeaba74602cdd850b48b8c9042
font_01_sfnt_off0000f214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF214 10816 bytes
SHA-256: c9f91cc6e64829f6b74629772d19404495030c25262013293958b17fbc04b73d
font_02_sfnt_off000116d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D6 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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