Malicious PDF — malware analysis report

Static analysis result for SHA-256 85028e7eb3686841…

MALICIOUS

PDF

79.5 KB Created: 2021-04-21 23:40:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e846cc4bbeabb3af91dd113892daef40 SHA-1: 703e0271a04a43d91e4bf4355c007b2f43e5364d SHA-256: 85028e7eb36868410c250f6339b094d0a8026677015d2f3552c09cff7ca6e4d9
134 Risk Score

Malware Insights

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

The PDF contains numerous external URIs pointing to disposable hosting, indicating a link farm designed to obscure the true malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were extracted, the PDF structure and URL patterns are indicative of a phishing lure attempting to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gimoguvi.ru/strik?utm_term=atlanta+night+photography+spots PDF link annotation
    • http://bezinawevudo.22web.org/how_to_change_quick_commands_in_autocad.pdfIn PDF document text
    • https://kewojuposadut.weebly.com/uploads/1/3/4/3/134374438/fazetodiv-vujezomivi-tagoromefus.pdfIn PDF document text
    • http://biwiroxefamir.mywebcommunity.org/impact_of_celebrity_endorsement_on_consumer_behaviour.pdfIn PDF document text
    • http://nipawifaxupus.mygamesonline.org/anarchism_and_anarcho_syndicalism.pdfIn PDF document text
    • http://vajukadezazi.getenjoyment.net/digi_002_mixer_driver.pdfIn PDF document text
    • http://lejunuzegakikuv.mypressonline.com/50876620952.pdfIn PDF document text
    • https://xavujome.weebly.com/uploads/1/3/0/7/130739328/jowimekovavu.pdfIn PDF document text
    • https://wepidunobon.weebly.com/uploads/1/3/1/4/131452842/1482825.pdfIn PDF document text
    • http://biniwitovo.mywebcommunity.org/ch_agriculture_class_10.pdfIn PDF document text
    • http://xafopawiki.medianewsonline.com/easytouch_indoor_control_panel_no_comm.pdfIn PDF document text
    • http://fozivot.mypressonline.com/allegory_of_love.pdfIn PDF document text
    • https://pukapukipek.weebly.com/uploads/1/3/4/6/134636258/4106413.pdfIn PDF document text
    • http://dokaxirugik.medianewsonline.com/xigitepiseludamawipije.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/huey_newton_revolutionary_suicide_quotes.pdfIn PDF document text
    • http://lidozabanej.iblogger.org/mcculloch_pro_mac_610.pdfIn PDF document text
    • http://tuforuj.mypressonline.com/94661652381.pdfIn PDF document text
    • https://vuvudosav.weebly.com/uploads/1/3/4/5/134579130/9211128.pdfIn PDF document text
    • http://xuforaxi.22web.org/77514487174.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bemabam.myartsonline.com/grammar_exercises_with_answers.pdfIn PDF document text
    • http://tupibamogowoful.rf.gd/29173091.pdfIn PDF document text
    • http://bevivose.rf.gd/soserugotuwufojudiku.pdfIn PDF document text
    • http://rozopujonabesix.epizy.com/58527748560.pdfIn PDF document text
    • http://supuwevul.atwebpages.com/how_to_analyse_quantitative_data.pdfIn PDF document text
    • http://zufabilo.rf.gd/amore_e_psiche_mito.pdfIn PDF document text
    • http://mojigoka.atwebpages.com/50439188827.pdfIn PDF document text
    • http://sagalesokalu.epizy.com/11217108975.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_off0000f7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A1 5172 bytes
SHA-256: f323c80c79c839a9fe6d33eaa86b14a008a645785afc67c03cc3681e7831f24e
font_01_sfnt_off00010940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10940 10900 bytes
SHA-256: f545d7118e50d23c57452af2c76092859d39898e8013a5ec2091246762ff7378