Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d5f91d4da98c7c1…

MALICIOUS

PDF

79.3 KB Created: 2021-03-30 00:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: aa60e7ad974f22a2ac37fb3fc192c580 SHA-1: 22e7da3e5cee7cb6e7217c022fe31389d2d917a2 SHA-256: 0d5f91d4da98c7c12c25ece068b99c6d5d64aba50ee3a26dbcc4b4ba00c3e442
186 Risk Score

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 0.9996

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://ponafet.ru/award?keyword=capnography+interpretation+pdf PDF link annotation
    • http://zizodoroluxonaf.sportsontheweb.net/wireless_communication_technology_blake.pdfIn PDF document text
    • https://cdn.sqhk.co/zifalulog/TOgiaF7/diversified_credit_union.pdfIn PDF document text
    • https://zujanotoze.weebly.com/uploads/1/3/4/4/134476942/968b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387565/normal_60217b97d8f29.pdfIn PDF document text
    • http://zovolexune.sportsontheweb.net/caderno_de_encargos_sudecap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381289/normal_60221b162f6df.pdfIn PDF document text
    • https://cdn.sqhk.co/pelemobi/jhegdii/rijepular.pdfIn PDF document text
    • https://gigorevexi.weebly.com/uploads/1/3/4/7/134714530/zozunibepid.pdfIn PDF document text
    • https://surevasod.weebly.com/uploads/1/3/1/8/131856145/a67313c477e86e.pdfIn PDF document text
    • https://bumarotijij.weebly.com/uploads/1/3/4/6/134688095/9511627.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473638/normal_5fe2728a5cf07.pdfIn PDF document text
    • https://bozoxemupep.weebly.com/uploads/1/3/4/3/134317316/5479316.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
    • https://s3.amazonaws.com/libusamagowuvo/camping_and_caravan_club_android_app.pdfIn PDF document text
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_9e24cc47503f41efbe5df99d7e434d95.pdf?index=trueIn PDF document text
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_acb6564cf4574d2cb59bea85598ce46c.pdf?index=trueIn PDF document text
    • http://gurabagoderes.atwebpages.com/32313908379.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/computer_science_illuminated_6th_edition_chapter_6_answers.pdfIn PDF document text
    • https://ecab545c-19d2-4654-b6ac-fb8b9749f5ba.filesusr.com/ugd/e5412a_7f6190f88c3640f3ad1462694a4c62d7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/davawina/purple_silver_eyeshadow_tutorial.pdfIn PDF document text
    • https://a2876ee3-c470-454a-91e2-e108d831033a.filesusr.com/ugd/e8dba5_1e4784ed9d744d8d87ee14c000048d6a.pdf?index=trueIn PDF document text
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_72b977d97be84f41abd665dd29c1879b.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81E 5008 bytes
SHA-256: d8bf2ffe221e910a59598aa2d1f04ee51f83891bb90f2e01450411e5992e36e9
font_01_sfnt_off0000f91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91F 11448 bytes
SHA-256: f9a44ea5ee75243ce998bc3c2a0f4f52c16df9904879aeef9b482c9fe083f432
font_02_sfnt_off0001200b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200B 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361