Malicious PDF — malware analysis report

Static analysis result for SHA-256 61374430430593d0…

MALICIOUS

PDF

133.9 KB Created: 2021-03-21 08:28:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d7286721c78f4913c011804975d1e94f SHA-1: 8944c502b939d34258ee655a05802633b55b3e1a SHA-256: 61374430430593d02ec0421fa7a6db1101340404bb50f189eab34590083e3f7f
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm with numerous external URLs, suggesting an attempt to redirect users to potentially harmful websites. The document body, though heavily obfuscated, appears to be a lure related to 'activity diagram uml tutorial pdf', likely to entice clicks on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/award?keyword=activity+diagram+uml+tutorial+pdf PDF link annotation
    • https://cdn.sqhk.co/nepopagugela/hEjeB6s/maruwebopasipotetatade.pdfIn PDF document text
    • https://cdn.sqhk.co/temejikowewa/mnjciUA/240922347.pdfIn PDF document text
    • https://getenulezawo.weebly.com/uploads/1/3/4/8/134897364/6308386.pdfIn PDF document text
    • https://sudazevoj.weebly.com/uploads/1/3/1/4/131406082/damiv.pdfIn PDF document text
    • https://mijagevamosekur.weebly.com/uploads/1/3/4/5/134515139/giwodimodop-dojopaz-sesukerel-xevemapug.pdfIn PDF document text
    • https://noduxulab.weebly.com/uploads/1/3/4/9/134901810/7364070.pdfIn PDF document text
    • https://jevalibiku.weebly.com/uploads/1/3/4/2/134266190/4597820.pdfIn PDF document text
    • https://cdn.sqhk.co/sesekopusoj/9iagjU3/triple_rashomon_gif.pdfIn PDF document text
    • https://cdn.sqhk.co/dobulefipuji/gwZduCS/d_day_history_video.pdfIn PDF document text
    • https://fasosizive.weebly.com/uploads/1/3/4/3/134351581/8262604.pdfIn PDF document text
    • https://gizutiki.weebly.com/uploads/1/3/4/4/134478998/mekofo.pdfIn PDF document text
    • https://jizeloxeresuvur.weebly.com/uploads/1/3/4/7/134763051/joxanipowunabuk-dekesafepiger.pdfIn PDF document text
    • https://vinovubetiloj.weebly.com/uploads/1/3/4/6/134679092/6351612.pdfIn PDF document text
    • https://zetojaxonafavop.weebly.com/uploads/1/3/5/3/135309172/numavagaga.pdfIn PDF document text
    • https://cdn.sqhk.co/rokabumake/02bnjjF/bijazotat.pdfIn PDF document text
    • https://nutapezuzuf.weebly.com/uploads/1/3/0/9/130969421/d13480c13633.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://edb7bb8d-792a-4213-93ec-7f573d37cc74.filesusr.com/ugd/bfd504_2da9d273a79042139b1c9d4918ca6fae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e5a1072-0379-4cee-b812-b99c5649c28a/what_does_no_ac_mean_on_orbit_sprinkler_timer.pdfIn PDF document text
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_fdcb5e36206445d2ad1a04c8fd1ce08b.pdf?index=trueIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_a12931b44020492397ce0a909ead49b8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd9d3f5b-d151-43b0-bba8-344d7b7c7e9b/xerenilijerejo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fd979ec-16a4-41c9-8b44-9b2c15ebe0b6/96423511502.pdfIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_1b4d9399bfe44d0fad45e1ca920aa4bd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b9da10e-7754-4b1e-bbdd-de755cea71fd/54271422532.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b985a5f-e24c-481a-b6a2-522de163b0f4/the_argonauts_are_named_after.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_off0001cf7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF7B 5448 bytes
SHA-256: fcb4bfef4def2676da340731f034c72cafbae3e2ed353b6f328ec23b08de31d6
font_01_sfnt_off0001e204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E204 11652 bytes
SHA-256: 1ae29a13391b4a876a0696196c6842fdcdac7ed200ccc6e0a6513767a394e6dd

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