Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a8d608e5b71c23…

MALICIOUS

PDF

73.9 KB Created: 2021-03-17 08:22:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c63841ddd2e045044fb4b9b3432b1ad SHA-1: 7c9eaf73e172f4e1db4b612fe4fd0425a2d1fa83 SHA-256: 85a8d608e5b71c233ac2fcdd925bd5cc57b905227dee4b4e2885ea5b4b2cd5bb
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. The document body, though heavily obfuscated, contains references to 'Arbys calories count' and the authoring application 'wkhtmltopdf', suggesting a lure to external content. The presence of external URIs and a link farm indicates a likely phishing or SEO spam campaign. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=arbys+calories+count
    • https://kojegowi.weebly.com/uploads/1/3/4/6/134685768/juwuvoduxogupot_fokuvox.pdf
    • https://zuwiwenulabir.weebly.com/uploads/1/3/1/3/131381762/70e7448af.pdf
    • https://woxopipuwesubaj.weebly.com/uploads/1/3/1/4/131453061/5cf183d901c86b.pdf
    • https://vulazijol.weebly.com/uploads/1/3/4/6/134648863/dekupavefani.pdf
    • http://sarupunojupud.sportsontheweb.net/calendar_2020_with_holidays.pdf
    • http://gitikirazidapi.medianewsonline.com/dejobopojezu.pdf
    • https://lonuxomefuju.weebly.com/uploads/1/3/4/8/134871759/bakosomegimolinaniwu.pdf
    • https://depumubawaminuk.weebly.com/uploads/1/3/4/2/134236244/dafatuse.pdf
    • http://warupipujamoru.sportsontheweb.net/declarao_nostra_aetate.pdf
    • https://nelemiken.weebly.com/uploads/1/3/4/7/134704654/vipapalanaxojuwizal.pdf
    • https://togodinaxudare.weebly.com/uploads/1/3/1/6/131637070/b8864dd10f1c5a9.pdf
    • http://tiriruno.sportsontheweb.net/ribetamiwes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/89bafa72-8b00-4bf5-b171-5921f2cc5903/basic_sentence_structure_exercises.pdf
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_4a29f9f14e6b4a09983c6da4d5da2398.pdf?index=true
    • https://391e4f24-9fc9-4707-ac06-338edcd9f959.filesusr.com/ugd/110ef3_69ef59de9ba043309d9f36586cd8b090.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1f97a3e5-dcb3-47a7-848b-bd2713113fad/solosevolusosuv.pdf
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_13ee4e5584524c98b2e555874dfac866.pdf?index=true
    • http://durenifujogax.myartsonline.com/11990084716.pdf
    • https://uploads.strikinglycdn.com/files/081d9c78-23b6-4c45-89f7-4dab0e821373/59449615230.pdf
    • http://sipuluku.rf.gd/73097012504.pdf
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_95265e505139480fb24a05cfedd640ea.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6fc03079-2975-402a-a9a3-77c2c994d0a8/what_is_the_equation_for_velocity_distance_and_time.pdf
    • http://kawojimulogizef.rf.gd/dosumojaxapevepe.pdf
    • https://uploads.strikinglycdn.com/files/20746354-426e-4a83-a4b3-5548433d5904/cronicas_de_una_muerte_anunciada_resumen_corto.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_off0000e3e7.bin
624ae104c9025f9fa9e994f0491ac089f43a3e83c1fc81bea113a2da6103e66a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E7 5024 bytes
font_01_sfnt_off0000f511.bin
49a23dbd4d2964ef5cfe6119ec04f1a1c793d7a55d7c165535e72cfd338cbef8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF511 11176 bytes

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