Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a86a9a2ac6ddbc9…

MALICIOUS

PDF

86.7 KB Created: 2021-03-30 21:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7aed6f5ddd1f1767f979e32b0d63de7d SHA-1: c969900035645055684aa9473be7b8028570ca02 SHA-256: 4a86a9a2ac6ddbc9e2089f728cd0ee3de3c2b55189d6f8963e9973504db049d7
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dafemum.ru/123?utm_term=frommer%2527+s+japan+guidebook PDF link annotation
    • http://mavaxur.mywebcommunity.org/kibij.pdfIn PDF document text
    • https://revijokatise.weebly.com/uploads/1/3/3/9/133999222/kazozunifosodap_lupebotoduxu.pdfIn PDF document text
    • https://zaxalaxixu.weebly.com/uploads/1/3/1/6/131606365/runafak.pdfIn PDF document text
    • https://runaxaneked.weebly.com/uploads/1/3/4/5/134505854/bopuk_retirakadel.pdfIn PDF document text
    • http://volulolusawaz.mygamesonline.org/area_of_all_shapes_geometry.pdfIn PDF document text
    • http://jijibujubogogi.iblogger.org/automotive_paint_types.pdfIn PDF document text
    • http://wemorewabadeluz.mygamesonline.org/ccna_3_chapter_1_exam_answers.pdfIn PDF document text
    • https://rubuvewoxuvima.weebly.com/uploads/1/3/4/8/134873715/netakeg_mevileposiv_vadimisapusu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://26b54b0d-7067-4615-bd5a-e9f638bc9197.filesusr.com/ugd/26f5b5_addef7fe67da4816be4a29caf8dac578.pdf?index=trueIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_36caaba53ee042da9e20ad938df708dd.pdf?index=trueIn PDF document text
    • http://wiwawilif.epizy.com/45559005944.pdfIn PDF document text
    • https://cd9ed9ec-87d1-42be-9198-0b2de6c1db4d.filesusr.com/ugd/158fb9_9f9c524d0d044dc9bf5dd314d677c914.pdf?index=trueIn PDF document text
    • https://3f735f5a-cd1c-4288-bd93-adeff6e084d9.filesusr.com/ugd/bcc0e4_c47c4f161925455c838e169c910f295e.pdf?index=trueIn PDF document text
    • http://viwefar.rf.gd/vulub.pdfIn PDF document text
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_29a5cee777be4c3c98d4fc5210ff53e9.pdf?index=trueIn PDF document text
    • https://5de6e22f-064f-4859-b003-4eaa502c5056.filesusr.com/ugd/2609e6_a0c1e064dbeb4a7cb6f5a3cf366cc45f.pdf?index=trueIn PDF document text
    • http://perufukag.epizy.com/time_for_us_piano_sheet_music_free.pdfIn PDF document text
    • https://f74ea38a-ab8d-49a0-8d31-9a1d7ce64423.filesusr.com/ugd/5ceade_6d5c2bc3d78f4bd484b1ec90fd434146.pdf?index=trueIn PDF document text
    • http://sosewovitifofus.epizy.com/understanding_business_valuation.pdfIn PDF document text
    • https://19aaccd0-9772-41b6-85c4-be118606641a.filesusr.com/ugd/a12125_53e0f6f5de6348aea1cd7ff699fb4f04.pdf?index=trueIn PDF document text
    • https://238a82c5-85a8-4641-a991-2f0f5270ddc4.filesusr.com/ugd/63f22d_a983be15e8f14619b4e46e04b98876ad.pdf?index=trueIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_71790ae0882043bf8e17f4fb5a14428f.pdf?index=trueIn PDF document text
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_7a917efd791045fea27e1d1089758160.pdf?index=trueIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_5cc2558e31dc4697bc084b7f5205bf03.pdf?index=trueIn 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_off000112d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D1 5516 bytes
SHA-256: 4a6a849cdf71bd2b3fbaeb377995deb49a73c4ec5246b7790fbe3db0fe14dc7f
font_01_sfnt_off00012583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12583 11568 bytes
SHA-256: eeba13d0a08990ce50f1da69dc986616bbf7f6920478c10dc7d3f1fa51f80997

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