Malicious PDF — malware analysis report

Static analysis result for SHA-256 72363a7976544a49…

MALICIOUS

PDF

76.4 KB Created: 2021-03-05 13:43:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e66ad802d48be548ed51e760ef253bf7 SHA-1: ac20de32b08538e9d5cc437ce16b35fc7479af92 SHA-256: 72363a7976544a49188fd64c1eb246fb119b20ebe85ae7bd40a9864e76c598e8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant number pointing to disposable domains and potentially malicious hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, often used to obscure malicious intent or distribute malware. The ML classifier and ClamAV detection strongly suggest malicious content, likely related to phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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://xezojetit.ru/award?keyword=average+yellowfin+tuna+price+per+pound PDF link annotation
    • http://zipubezexupoka.mywebcommunity.org/2018_first_aid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451563/normal_600d71f260b46.pdfIn PDF document text
    • http://wemepena.iblogger.org/wreckfest_tech_demo_2._0.pdfIn PDF document text
    • https://cdn.sqhk.co/panufarubel/jaqz5jb/play_island_experiment_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483354/normal_5ffbeab28db17.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374517/normal_6009998c81d75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372358/normal_602339b5f4005.pdfIn PDF document text
    • https://cdn.sqhk.co/kodivitedi/jiifiev/best_cheap_racing_wheels_pc.pdfIn PDF document text
    • http://jofised.iblogger.org/rokebepujowalalotelugi.pdfIn PDF document text
    • https://cdn.sqhk.co/liminekaj/fbTMXV9/supanusozitowemujobaj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449793/normal_5ffbe6ccad1cd.pdfIn PDF document text
    • http://wewofif.scienceontheweb.net/fudoferajegamewujepeb.pdfIn PDF document text
    • http://kigumelez.medianewsonline.com/nenezosapajowum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sefogapilaz.epizy.com/what_is_the_main_theme_of_the_yellow_wallpaper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d15aa3a9-61fd-4b16-bc1d-9e2b2d125d06/integration_of_3_cos_x2_sinx2_cosx3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e19fa68-682a-4e81-8505-435f5e0a77ba/monsieur_ibrahim_and_the_flowers_of_the_koran_movie_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47ce0a8a-339d-4a69-b61d-e065263f0472/demovewixikaruwijus.pdfIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_602c3948d83942a4a2337fa8193baf2d.pdf?index=trueIn PDF document text
    • https://1f2f8e77-98df-4c5e-b88a-83bc2b612b58.filesusr.com/ugd/5c7528_9f1ba10d0d034907a504ecebe184ab57.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dccd3342-6067-4edb-b934-9ea60003baaa/negulafabubusubo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47786c95-05e5-4d72-bfc1-af4c40db7b05/first_alert_ready_seal_mounting_instructions.pdfIn PDF document text
    • http://pezamax.myartsonline.com/favuxiwoveva.pdfIn PDF document text
    • http://kojenixerog.myartsonline.com/hp_officejet_pro_8600_plus_manual.pdfIn PDF document text
    • http://pukupufiribeja.epizy.com/40979920785.pdfIn PDF document text
    • https://8c77b9b7-c39b-43d6-9406-6086bd2c0f93.filesusr.com/ugd/ee6770_2354b92417544eeeb2e50478d73c4736.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_off0000ed26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED26 5388 bytes
SHA-256: 9933271e50efd22c77fc4f176a9cc7a31027c2e5d668ee1cc8fa47961006868b
font_01_sfnt_off0000ffa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA9 10732 bytes
SHA-256: 80fbdc7eb7981cbfb6c8fc69b8c4002430a3b59b28a4c434b1eb852e92a353a6