Malicious PDF — malware analysis report

Static analysis result for SHA-256 c476690528397d27…

MALICIOUS

PDF

89.5 KB Created: 2021-03-17 11:20:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 132e28eb3658a029da4423dedd84e8bb SHA-1: b7ac014caebf9f14462826a10766912c72d1bb2d SHA-256: c476690528397d2759521ae7bee814d6877abe4ba570c927417493ebb767d630
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to zajinet.ru, which is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, potentially leveraging a PDF vulnerability or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://zajinet.ru/strik?utm_term=flysky+gt3c+manual+pdf
    • https://cdn.sqhk.co/rizijuwet/icjiFb0/amazon_seller_central_contact_number_uk.pdf
    • https://cdn-cms.f-static.net/uploads/4467043/normal_601a6f42ad433.pdf
    • https://static.s123-cdn-static.com/uploads/4386087/normal_6002c545d00e0.pdf
    • http://criticcxck.space/15843094205vsjh4.pdf
    • https://cdn.sqhk.co/muribirigim/jhhaIOT/xabuliposidojivonaxureb.pdf
    • https://cdn.sqhk.co/feguzuvubut/ifIssJq/wigujepim.pdf
    • http://rubeatyshop.xyz/example_of_research_proposal_abstractqzrq4.pdf
    • https://cdn.sqhk.co/fasisela/jn7jjgc/prestonplayz_among_us_videos.pdf
    • https://static.s123-cdn-static.com/uploads/4489598/normal_5fc85775a0d14.pdf
    • http://presalle.xyz/sri_vishnu_sahasranamam_path_in_hindiutpa0.pdf
    • https://static.s123-cdn-static.com/uploads/4481847/normal_5ff3f443b83e6.pdf
    • https://cdn.sqhk.co/tenokesime/ijgimgd/airplane_crash_dream_auntyflo.pdf
    • http://mastericy-chistoty.ru/anarkali_malayalam_film_freeno6qy.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/abade20c-c702-4d1a-88f5-b000fc300687/fulezezebutopomabemakigug.pdf
    • https://s3.amazonaws.com/pekatikisuruki/french_manicure_guide_strips.pdf
    • https://9e7b01ce-91ce-414a-93c5-ade8df4b7359.filesusr.com/ugd/cfbfd2_52d73908bcfc44459f2c04804d0dac26.pdf?index=true
    • https://e82ff0bd-cb1a-4782-8b92-0a0fb7657660.filesusr.com/ugd/d17951_ce75929a7f144775b95b1ec637f1bef1.pdf?index=true
    • https://s3.amazonaws.com/lupuvogotog/timaxemisugo.pdf
    • https://uploads.strikinglycdn.com/files/3f1d36ba-c95b-4662-9ef0-3db1f31fd115/terujigis.pdf
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_e0e62b08b3e04322a61b3cc0a7337c80.pdf?index=true
    • https://s3.amazonaws.com/dobesogum/nexofupoviwobukobe.pdf
    • https://s3.amazonaws.com/zuponefi/suzisifegerasubukuziwul.pdf
    • https://s3.amazonaws.com/kezemiradigu/66946006146.pdf
    • https://uploads.strikinglycdn.com/files/360f9b28-18d8-438d-bcea-bac16cb426fc/79946308299.pdf
    • https://uploads.strikinglycdn.com/files/2f92dcc2-8071-4e93-8241-01f722feb8d5/wodudalapanasibi.pdf
    • https://uploads.strikinglycdn.com/files/4d52952f-5651-4792-8afe-0c9fb1219344/tugof.pdf
    • https://814cba0f-f649-4223-bfe6-7884e6e02b9d.filesusr.com/ugd/c1108c_e7b3fa0baff94a76812ff06333a031fd.pdf?index=true
    • https://eeeff038-21f9-42a6-bde0-cd945221d618.filesusr.com/ugd/9dc459_b553b8fb542346a298dc7416c065f943.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bcd.bin
2827b2b951ec38a0f1e1bf116e6b1908ff923811ad8b8413bc7f770f19342316		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCD 5664 bytes
font_01_sfnt_off00011f24.bin
a78bef7774706232127510b77c341e68443232e8233779954862dfcc92295d19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F24 17340 bytes

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