Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5be329af003b22d…

MALICIOUS

PDF

76.3 KB Created: 2021-04-03 09:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7e2733122e36e42e09e98265982b1bf4 SHA-1: 278692e8585d89f09b3643495af86eff452ddf29 SHA-256: d5be329af003b22df5199f35cf5f83df0752472c4db4b62fea83fc725d17cbe9
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or conducting phishing. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to malicious content.

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://midufefew.ru/strik?utm_term=elna+supermatic+sewing+machine PDF link annotation
    • https://jelaxatibepa.weebly.com/uploads/1/3/2/6/132681396/9606671.pdfIn PDF document text
    • https://cdn.sqhk.co/pizililiv/ieliWRH/verumilozitavoxekenegajel.pdfIn PDF document text
    • http://avtoshkola-region26.ru/68529900180h1hw0.pdfIn PDF document text
    • http://pearhaidhr.fun/bugosunogat9ob1m.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/Mgi85M4/ticket_to_ride_rules_usa.pdfIn PDF document text
    • https://xazonulukobimov.weebly.com/uploads/1/3/2/7/132712199/4036488.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/eiaKj5u/vumidasubebunuduxalubik.pdfIn PDF document text
    • https://dizilezojo.weebly.com/uploads/1/3/4/2/134234798/4330318.pdfIn PDF document text
    • https://cdn.sqhk.co/riwaxagi/ijjjjgf/php__server_remote_addr_null.pdfIn PDF document text
    • http://useporte.xyz/laziloxujemutebudakivoxuc95bn.pdfIn PDF document text
    • https://cdn.sqhk.co/pobojatizopa/81bUZie/lisubirunosibejagebibe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_f110044ec7b54fa884087da13d2f86df.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xojafemori/adj_tripar_profile_plus.pdfIn PDF document text
    • https://09d56968-2ae9-412d-ad86-e67dc63a1c23.filesusr.com/ugd/e8b91f_7477d082b28d44a3bbd6a5b066ef685f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bc39ca3-0786-4092-beb5-bc36d4df8396/jesinobumaju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2c61093-8ab4-4efc-b1f0-c418a3248536/53306463597.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/alien_vs_predator_3_game_pc.pdfIn PDF document text
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_fadcb45b4c544385b40d7634aeb45e2e.pdf?index=trueIn PDF document text
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_59be639643714cf99dec0ddb3edc9183.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/zokewufufapisufejoxipowim.pdfIn PDF document text
    • https://5efcf519-4c71-4be9-a00f-e1d47ba804c5.filesusr.com/ugd/ebcc4b_57021fe3a21c4d6bb7affd6707f1acaa.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_off0000eb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0D 5396 bytes
SHA-256: 685bf133ca06fdac36133edfe71a5a7bf7a7fa251052c285daa8ef91fd747b7a
font_01_sfnt_off0000fd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD55 11184 bytes
SHA-256: bff44ac8a74293c197e3528c79246383d12d0cf8772941e2e09c6c835c1a75d8