Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81ca2c0c2bccf9d…

MALICIOUS

PDF

77.5 KB Created: 2021-03-07 06:26:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: b5c72c8adf028ed772aef60fd92e9fd7 SHA-1: 859326b8671886c119c02956d5adc15ea5016947 SHA-256: c81ca2c0c2bccf9d49afa8ddacba71a116e63555e27c88095047ba507bdeb054
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm by heuristics. ClamAV detection and ML classification strongly indicate malicious intent, specifically phishing or malware distribution. The presence of external URIs and the link farm heuristic suggest the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pelibifir.ru/strik?utm_term=remington+700+adl+to+bdl+short+action PDF link annotation
    • http://coolvdomaion.online/tabela_de_preos_de_carros_semi_novos_fiato0acs.pdfIn PDF document text
    • http://esagafow.fun/wikokoboro1ck5w.pdfIn PDF document text
    • http://domavera.ru/lexijuburoosfai.pdfIn PDF document text
    • http://batmbatm.ru/fikifodipujinogaxuu3dno.pdfIn PDF document text
    • http://muzoc.xyz/jasabizuzizapapabuxeptk2d.pdfIn PDF document text
    • http://neyroskakalka.site/46188658583egplu.pdfIn PDF document text
    • http://romeoplanet.club/rokelibazuwowilu1dlqe.pdfIn PDF document text
    • http://wide-do.top/98633744423rht2m.pdfIn PDF document text
    • http://kasyanbeauty.com/40317870610guo83.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_42635c3febad450db9e0af7dadbf5fe0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/21d3e451-8417-4ee8-97f8-f968a0b17c9f/what_network_is_the_white_princess_on.pdfIn PDF document text
    • http://vofofoduwegakuv.rf.gd/firewall_software_free_for_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43f779c7-2d69-451b-96ca-1aaf75047147/zunovetikasojemuxiraxu.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/jemepunovosomukafig.pdfIn PDF document text
    • http://rewiruf.rf.gd/wewowijuxugubul.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/alaska_kodiak_coal_stove_hopper.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/clarinet_sheet_music_for_silent_night.pdfIn PDF document text
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_123283a027294a449434b16b94057c47.pdf?index=trueIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_03f348654d7548cdad1561964c0a6388.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dujepav/sedegibaxexusazinezi.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/56538451033.pdfIn PDF document text
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_8976319168154816bb49cbe871f4bcb2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff6ca92d-473e-4d09-940d-54b0e9716429/89623511562.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA7 5724 bytes
SHA-256: d1c7535fc990f5a8889072e0389ba4f64a358a77c8b52e62cddc32965d74b4ba
font_01_sfnt_off000101f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F9 11260 bytes
SHA-256: 4419b657ed400540ac2d20446f037f80fbe81f5314d6e4f5c58eeb4a830ce5a8

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