Malicious PDF — malware analysis report

Static analysis result for SHA-256 defea4726ad699f8…

MALICIOUS

PDF

85.4 KB Created: 2021-05-15 11:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c685e5f3dc777c719aca30e247bbfc7c SHA-1: 179888bda0d229aa8ab2b86a8a3edaa3846626e7 SHA-256: defea4726ad699f84f3d5d4f33829ee50f2d3fe9dff9fe2b48dcd307281ba844
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://xezojetit.ru/strik?utm_term=2014+harley+davidson+softail+deluxe+owners+manual PDF link annotation
    • https://cdn.sqhk.co/fodexuxefeba/fhchhDT/vuxitidafoti.pdfIn PDF document text
    • https://cdn.sqhk.co/raxasumo/aihjhgd/taptap_apk_pubg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410414/normal_5ffe784ae5592.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451021/normal_60537058d28dc.pdfIn PDF document text
    • https://cdn.sqhk.co/mezugifosa/HbZVjhj/lasajesu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418963/normal_6033f8e5701b1.pdfIn PDF document text
    • http://sodaapp.club/letter_of_invitation_to_visit_usa_template1w2sy.pdfIn PDF document text
    • http://noksipals.online/2020_election_polls_map_floridan69qg.pdfIn PDF document text
    • https://cdn.sqhk.co/kojivitew/lYjjjen/bomup.pdfIn PDF document text
    • https://wunanowadile.weebly.com/uploads/1/3/4/6/134600652/4960223.pdfIn PDF document text
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/demow.pdfIn PDF document text
    • https://waxalema.weebly.com/uploads/1/3/4/3/134364729/zivurilo.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/06d2ee14-f7e6-4359-8e42-0dcf5cda70d6/the_fallen_angel_book_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4a280e2-8fd6-4e62-8a7f-b4b752b855c2/chromatic_harmonica_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90770312-f4d6-4e61-8567-7eb530315b80/giwolulanubajevowo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12111fb0-7941-4add-9bf0-818fe34946dc/time_management_skills_for_teachers_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/463203cd-2aab-4100-bdd9-47f28986dadc/tl-wr841n_openwrt_repeater.pdfIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_3dfa172eb4864530aeb76dc8a3e2de99.pdf?index=trueIn PDF document text
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_c652267e34ff4f32adc5431c879aee8e.pdf?index=trueIn PDF document text
    • https://bff5fdab-9fd0-4670-908b-a1308bb5a9cb.filesusr.com/ugd/227d0f_e58fd6168845408ea9aef748205b7f37.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_off00010ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA3 5788 bytes
SHA-256: 4edd18c58b520236219dce4fdcccced82bd524b8d7e671c830d4d4390ef56af5
font_01_sfnt_off00012055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12055 11504 bytes
SHA-256: 40fd957e231e6da656d9e0fddafb9dbabbc18475fa30ef36618c72734841c366

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