Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ae97ac6fbad147e…

MALICIOUS

PDF

79.1 KB Created: 2021-03-15 21:00:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5f040c1bc0a504d4fdb6f422f821bc30 SHA-1: 9f3fbdc64e5f90663537c1bd8dbce73b0f2016b3 SHA-256: 0ae97ac6fbad147ea621fac59bf8a00e09701c2a5db027dcf53c5e44a7e3da4a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

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://jacksth.ru/wix?keyword=yu+ling+zhu PDF link annotation
    • http://baxezafewel.iblogger.org/apa_manual_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416664/normal_60112583b887e.pdfIn PDF document text
    • http://vobigivu.22web.org/blockchain_applications_a_hands_on_approach.pdfIn PDF document text
    • https://cdn.sqhk.co/rufopunuk/ihbThc5/evil_zone_wiki_characters.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/87124137141.pdfIn PDF document text
    • https://cdn.sqhk.co/dizukenepu/gd4gjhg/68568731497.pdfIn PDF document text
    • https://cdn.sqhk.co/debefuki/cwHkEjd/yellow_light_on_iphone_11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366632/normal_6037233dbb144.pdfIn PDF document text
    • https://cdn.sqhk.co/nexasolonit/JjujiUj/kekasemusofa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447630/normal_604035ec73f9b.pdfIn PDF document text
    • https://cdn.sqhk.co/nudekikusefi/TrjcibP/dagaxafamoxe.pdfIn PDF document text
    • http://sodowetan.mywebcommunity.org/fraud_examiners_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/fijigqV/64969963969.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tunakaxawonisov.epizy.com/1630595259.pdfIn PDF document text
    • http://jivugojazop.epizy.com/penozip.pdfIn PDF document text
    • http://jalijoruki.atwebpages.com/66149473025.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51043122-65b8-4f00-971c-034d41b5f5af/how_to_use_proform_hybrid_trainer_without_ifit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01e99e19-3364-400d-a41f-a8ba1833a379/how_to_train_for_rock_climbing_beginner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65c1e876-a6f0-46c1-ba94-be873e447fb0/how_to_drive_manual_downhill.pdfIn PDF document text
    • http://jusopetikikij.onlinewebshop.net/caste_validity_application_form.pdfIn PDF document text
    • http://mujujum.epizy.com/sparklebox_letter_formation_worksheets.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
stream_002_off0000e306.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE306 5584 bytes
SHA-256: 2a8795f9864e8a67e76cd1c928f429263bc3fbfcea0e728452601fb831d500cc
font_01_sfnt_off0000f61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61A 4476 bytes
SHA-256: 1ce1c4efa929864f1954ab680e5e46e2822164f4442838bdf6ce3cba584716b7
font_02_sfnt_off0001055f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055F 12760 bytes
SHA-256: 1996aa9cc55a381d8fa865428ceeb6d29653a4a4d668948db618e95d41e25cb9

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