Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dbbd23b519053ec…

MALICIOUS

PDF

81.1 KB Created: 2021-05-14 13:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98e4f0db5853b1beaaf180f5ec534ec5 SHA-1: 5342e58c71bbefcc6459c5f132ec0c2384757825 SHA-256: 5dbbd23b519053ecb89ff8636b0be20694a015dde9f7a87875be2905b940b449
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with the primary one being a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, contains a lure related to oven repair, suggesting a social engineering tactic to drive traffic to the listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/strik?utm_term=why+won%2527t+my+oven+work+but+burners+do
    • http://axacheat4.xyz/how_many_carbs_are_in_panda_express_teriyaki_saucetfcyo.pdf
    • http://jilet2.club/773579644282i2hn.pdf
    • https://cdn-cms.f-static.net/uploads/4384480/normal_605f2e36259a2.pdf
    • https://static.s123-cdn-static.com/uploads/4370068/normal_5fc8b3e6e9bd5.pdf
    • http://legegapepapo.medianewsonline.com/fagorexavifigodozez.pdf
    • http://gejesixave.scienceontheweb.net/87009881916.pdf
    • http://mapotilij.mygamesonline.org/sebutkan_47_process_project_management_dalam_bahasa_indonesia.pdf
    • http://vitalia-transports.com/seziwagobafewyns7v.pdf
    • http://verefdliyvtorogo.xyz/wendys_application_talentreef2nuuo.pdf
    • https://static.s123-cdn-static.com/uploads/4384839/normal_5fe40aeb6fade.pdf
    • https://static.s123-cdn-static.com/uploads/4387939/normal_6009858ca1ada.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ccd0733a-60c9-40bc-bdd0-8866f7111b75/75254215227.pdf
    • http://nejesezape.myartsonline.com/marketing_manager_jobs_dubai_salary.pdf
    • https://s3.amazonaws.com/vesubodufisi/77497056443.pdf
    • https://s3.amazonaws.com/nonipesikiri/gogiwonaramapipinejurow.pdf
    • https://uploads.strikinglycdn.com/files/b07b0233-9276-4c0e-b659-491dcda3eb54/tubuwinizusilexadosaxona.pdf
    • https://s3.amazonaws.com/gixirojozogufux/13339065076.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_off000102c2.bin
d8c4d59df28eac48931dc47541b1527559b1db57949070c285dd5dcbb5a12e04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102C2 5328 bytes
font_01_sfnt_off000114d9.bin
f3747558e28ae7f9187cead94764836f9f883fadaced5565f6e2142ae13e09f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114D9 10092 bytes

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