Malicious PDF — malware analysis report

Static analysis result for SHA-256 82144fcc7859848c…

MALICIOUS

PDF

88.5 KB Created: 2021-04-03 22:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8c199fa50bd802be45700837993264e8 SHA-1: 81de79cb8ebff8a60255742d8a6815d9aa59061c SHA-256: 82144fcc7859848c485e04b4973e43334f44b764e621a43056fc19bed553d4d1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to drive traffic or distribute further payloads. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to redirect users to malicious sites, potentially for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://zajinet.ru/strik?utm_term=compare+freak+the+mighty+book+and+movie PDF link annotation
    • http://vkysnaya-eda.site/pozukewetusudotud2qsrq.pdfIn PDF document text
    • http://fredo.bike/frances_gramaticaqfc4c.pdfIn PDF document text
    • https://cdn.sqhk.co/lepowabog/jUicEgc/sovobepifasebezakaf.pdfIn PDF document text
    • https://cdn.sqhk.co/lubometusoz/aXnhigg/rurekowaku.pdfIn PDF document text
    • https://cdn.sqhk.co/pugepavofu/26hekhf/warlings_armageddon_2.pdfIn PDF document text
    • https://cdn.sqhk.co/lorotukogof/frjf9xx/note_taking_tips_for_middle_school.pdfIn PDF document text
    • http://canlisohbetim.net/how_to_win_cricket_betting_tipsnnib3.pdfIn PDF document text
    • http://itasummer.fun/79514989195s3lpq.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://uploads.strikinglycdn.com/files/fa8e704b-549f-4e22-a022-e7ece2e6435d/goxakozod.pdfIn PDF document text
    • http://zawagebojirowe.rf.gd/feluv.pdfIn PDF document text
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_8625cf34bd994e85aac7ebd447232ed6.pdf?index=trueIn PDF document text
    • http://vezoxonu.epizy.com/kmspico_activator_for_windows_7_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ba2eeda-1451-436d-8c86-9ab9bdd10b8b/plantronics_m180_earpiece.pdfIn PDF document text
    • https://06e27459-8a58-4d01-a48e-f853eab966f6.filesusr.com/ugd/55f1a0_1aec220477594fde997ee8a7c70a9f4b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5b6fab9-a5e2-475b-a56a-c43b7f78dfc5/1794-oe8h_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faffd0e2-b33f-4f0d-a1e0-3254ea7d2ac6/nisemolikopupodovepoxak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a36cd53f-fd1b-4920-8839-21a9c37a9446/black_hawk_down_movie_opening_scene.pdfIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_7f0138c0b3744db493114afd78713d81.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/03f94c24-0742-4975-a3cd-4f3980cc3724/jataxijuvexiwulazudov.pdfIn PDF document text
    • https://40fd9d30-e691-4ad4-9ff9-7de67b304886.filesusr.com/ugd/45b27a_0e277ab06e5b4e008a971d9f055d5082.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c9e2321-27e3-4a40-a212-db6feb7b5432/37946801598.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b0b7197-9727-413b-81e6-e0d0f0c1d043/4355953595.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_off00010aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA1 5424 bytes
SHA-256: 2a0bc417c6609014c5c8fc68c037e40bd8b97e1c3b214b0c803140dad78058db
font_01_sfnt_off00011cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF3 11608 bytes
SHA-256: 2b46aea0e5a71c8cd864935726da4a9b2448a101d6eb1d897f541c7d11451cff
font_02_sfnt_off0001444a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1444A 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3