Malicious PDF — malware analysis report

Static analysis result for SHA-256 8588c32088ccc089…

MALICIOUS

PDF

79.4 KB Created: 2021-06-13 07:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e39a88e1e47ab4d41f268bf7a2504240 SHA-1: 4f08f437e7bc9828df4ca6d5554d1156c2e0b1be SHA-256: 8588c32088ccc08989a458f40a84b9c4ed6abec08bb6207e4e40a146899a3d0b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://baarspo.ru/123?utm_term=music+ballet+class+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4410217/normal_5ff1e43b75d8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411218/normal_605ee9fd45b09.pdfIn PDF document text
    • https://kakojimogik.weebly.com/uploads/1/3/0/7/130775570/46b4be9513c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446931/normal_5ff0c2cba84df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486523/normal_605fa1723ea0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366063/normal_602c48ed61f89.pdfIn PDF document text
    • https://dawikuwavuvuka.weebly.com/uploads/1/3/4/8/134866752/fonekazovulu.pdfIn PDF document text
    • https://meripowubizaj.weebly.com/uploads/1/3/5/9/135959363/6648433.pdfIn PDF document text
    • https://tigasuzile.weebly.com/uploads/1/3/1/3/131379741/nosoxubibifogirimar.pdfIn PDF document text
    • https://juwarojolajekol.weebly.com/uploads/1/3/4/1/134108785/balar.pdfIn PDF document text
    • https://fimulumalopa.weebly.com/uploads/1/3/5/3/135326017/11d9ac454.pdfIn PDF document text
    • https://dugigezulafi.weebly.com/uploads/1/3/4/8/134898894/fitil-fanawis-kamuxubonusep-julinu.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4502920/normal_60b4db2448d7b.pdfIn PDF document text
    • https://sokufadatapa.weebly.com/uploads/1/3/4/4/134474271/3850251.pdfIn PDF document text
    • https://lulodepi.weebly.com/uploads/1/3/0/7/130776712/fizerebasepu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388839/normal_60546899b9ae0.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://zikasamu.pbworks.com/f/metowegu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a4df063-738b-4420-8fcd-cc90b52eb430/what_is_the_best_game_board_to_buy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11e1e83a-4b38-478b-9c91-98d78510814d/montessori_teacher_training_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31d06697-afd1-48ab-bec9-0e30d72cde32/how_many_calories_in_dunkin_beyond_sausage_sandwich.pdfIn PDF document text
    • http://nunaruribeg.pbworks.com/w/file/fetch/144616284/naruto_vs_bleach_unblocked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4de027c3-cbd2-4a16-91b2-7244d71bd0c4/9936238249.pdfIn PDF document text
    • http://jolowajuwijo.pbworks.com/f/4114500016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54baf870-2263-4180-baf1-9f0d48d4e5bb/xipevibapom.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_off0000edb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB7 4688 bytes
SHA-256: 27b2123fe5eec7d721faae5090afe5c49226935e46d56bef4ab5338514c8446a
font_01_sfnt_off0000fdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB4 10820 bytes
SHA-256: bf10d5081f71cf1acaa8a5dd73a7f6504e1945921dba128ae3b7f74a0941d880
font_02_sfnt_off00012200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12200 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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