Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bbefc4d45e98d74…

MALICIOUS

PDF

79.0 KB Created: 2021-03-19 15:43:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f083110eb0f4bb3b3c9538f1c9975f8f SHA-1: efa2660f68689fcf29098aeb6f319f242507d26d SHA-256: 3bbefc4d45e98d742ae787999d04d430d11267e4433be8b965a9debd2c47c7ee
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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/123?utm_term=game+chocobo+racing+ps1+for+pc
    • https://venowogofopow.weebly.com/uploads/1/3/4/6/134611371/487fe045d3190d.pdf
    • https://cdn.sqhk.co/wumidimux/jjiXgjt/fukuvabepavoroxabovupuj.pdf
    • https://xisosisudotaju.weebly.com/uploads/1/3/0/7/130738948/vezopewot.pdf
    • https://mokoluwi.weebly.com/uploads/1/3/4/5/134595511/8122977.pdf
    • https://lepatoketi.weebly.com/uploads/1/3/4/7/134732542/dusosepan.pdf
    • https://cdn.sqhk.co/vameduvide/ifYBCjh/85740361171.pdf
    • https://cdn.sqhk.co/xalibolopov/Chfo5kN/short_lifespan_pets.pdf
    • https://lovaxases.weebly.com/uploads/1/3/4/6/134685664/nomuw.pdf
    • http://bijopesenof.iblogger.org/fosobukigenu.pdf
    • https://nekemobo.weebly.com/uploads/1/3/5/3/135323096/tesipidezi_nenesoxoligolel.pdf
    • https://cdn.sqhk.co/jaguwubax/haedgc0/buxamefiwirobikepasal.pdf
    • https://cdn.sqhk.co/munoforifuso/ghg1f7u/crazy_taxi_classic_apk_obb.pdf
    • https://vodunifowabot.weebly.com/uploads/1/3/5/9/135992931/mipebubawi.pdf
    • https://safusugefivelu.weebly.com/uploads/1/3/4/3/134346528/8450312.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f146df67-d77a-4a9c-af3c-0fa8a5fb65bc/monkey_business_illusion_video_download.pdf
    • https://s3.amazonaws.com/dazemi/71267419359.pdf
    • https://s3.amazonaws.com/dazovosugev/50204545087.pdf
    • http://diribiboturo.epizy.com/7544419311.pdf
    • http://zadakirilavaru.rf.gd/jspdf_autotable_doc._text.pdf
    • https://uploads.strikinglycdn.com/files/a67e186f-268d-46ae-82d6-6675c26cdfcc/nothing_else_matters_bass_tab_guitar_pro.pdf
    • https://s3.amazonaws.com/sezebepit/71228989720.pdf
    • https://uploads.strikinglycdn.com/files/fea4070c-fd79-47a3-9d73-93bbf6bd7e7a/baofeng_uv-5r_dual_band_two_way_radio_black_range.pdf
    • 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_off0000f60d.bin
5e6f741a35bdc560d03a42c86b8310c07455cd37afbfcdb38046a4c32e2601e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF60D 5620 bytes
font_01_sfnt_off00010908.bin
ab26723bb525f23b261173917566e057a349f6db65d00fa766bdb92dcbc5aec6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10908 11100 bytes

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