Malicious PDF — malware analysis report

Static analysis result for SHA-256 29d4d485d234d6d1…

MALICIOUS

PDF

79.7 KB Created: 2021-06-02 23:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a2b2f449fe1badb3a1af65cae17780ab SHA-1: 5451e40b68a42a77c2894d5d2061e567cefc0f73 SHA-256: 29d4d485d234d6d13060e895a4559e7327408e511e0ec684b16204f4cd8ea3d0
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 0.9990

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://medvor.ru/pbw?utm_term=motu+patlu+cartoon+video+mp4+download+pagalworld PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490370/normal_6039bcdf38096.pdfIn PDF document text
    • https://gajegewajutop.weebly.com/uploads/1/3/0/7/130739456/3144091.pdfIn PDF document text
    • https://kademagora.weebly.com/uploads/1/3/4/8/134850034/zubotajepej_xisawelopetev_dozagiduvufil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391008/normal_6044fda775cf6.pdfIn PDF document text
    • https://regutipedazuvi.weebly.com/uploads/1/3/1/0/131071249/8eac03a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424985/normal_5fd139649d071.pdfIn PDF document text
    • https://duvujisukodat.weebly.com/uploads/1/3/4/6/134674851/4872128.pdfIn PDF document text
    • https://milanabez.weebly.com/uploads/1/3/2/6/132695465/2206806.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500444/normal_5ff7a4bcb8c81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391326/normal_6053028beaf3c.pdfIn PDF document text
    • https://newimogo.weebly.com/uploads/1/3/1/0/131070302/vobewalo-lofol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446789/normal_5ff003d11ad41.pdfIn PDF document text
    • https://xizotikozuza.weebly.com/uploads/1/3/4/5/134587863/texewe_degulojowapu_wuvup_zowopevevuva.pdfIn PDF document text
    • https://kubazavazagemu.weebly.com/uploads/1/3/4/4/134464578/lovefimuk.pdfIn PDF document text
    • https://loxuvamozevu.weebly.com/uploads/1/3/4/3/134310095/gevijavoviduwarepug.pdfIn PDF document text
    • https://tonibakak.weebly.com/uploads/1/3/5/3/135346506/fuvobuwu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468259/normal_5fca9d81a5c6f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a68f62d-ac22-4254-8b37-8cb2239c4158/first_alert_sco500_false_alarm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/871ff0ca-53ce-4dd4-934c-197acaa5807d/25413796299.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad57c635-1be7-4193-98aa-8ec4fb068a91/a_dolls_house_act_1_and_2_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2607f819-1bff-46b8-888f-54f567fe582d/my_lenovo_tablet_wont_turn_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/707bb1f1-f52b-4c9b-8d7e-db1f955a417c/gaviko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c24269dd-4298-4b49-97b5-28e13a6d74c5/bhagavad_gita_explained_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4643fcfd-fb7c-4713-8521-12b93b414d2c/dell_optiplex_790_motherboard_chipset.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_off0000ec90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC90 3016 bytes
SHA-256: a7c7730a2a9ff25bf2418fc5d4a684afa95788f4fa1847662f10eb2b494667cf
font_01_sfnt_off0000f760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF760 5460 bytes
SHA-256: 11ab1f1436f0add718487e89babea49f6c38aee217994a526e7a8d2f34bcdb40
font_02_sfnt_off000109ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FF 11328 bytes
SHA-256: 8f15e9b084dc9c191f13f47f6acf3e34fa74416b42d7d603a1c8413dafac1a24