Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a3396805e73a204…

MALICIOUS

PDF

109.9 KB Created: 2021-04-06 01:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5d4206368f4737440f726e3b0cad5648 SHA-1: 23a8e8e242a4d5186cff083e90b51da42e4ffa95 SHA-256: 1a3396805e73a204cda7bd76da24983b2f63056da4dbb248ede11f7cdbb3f4fa
146 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a callback phishing scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('gimoguvi.ru') that appears to be part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick the user into initiating a fraudulent transaction or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=how+much+does+it+cost+to+get+a+driver%2527s+license+in+ms PDF link annotation
    • http://tututot.mygamesonline.org/bolts_specification_chart.pdfIn PDF document text
    • http://xuzerujagojagip.scienceontheweb.net/91531359539.pdfIn PDF document text
    • http://demuxum.getenjoyment.net/berliner_platz_2_neu_glossar_deutsch_englisch.pdfIn PDF document text
    • http://kolometagavim.22web.org/apostila_dreamweaver_cc_2020.pdfIn PDF document text
    • http://rexexepunefa.22web.org/18313171084.pdfIn PDF document text
    • http://fuwefepor.iblogger.org/age_of_reform_us_history.pdfIn PDF document text
    • http://gitipakivo.iblogger.org/jebabavipabakibigo.pdfIn PDF document text
    • http://bukapim.mywebcommunity.org/assessment_development_center.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_4f6ef982fd014c40b45823fb83cf555c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/tinomegezokesuxaboninaj.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/butowewitujogidu.pdfIn PDF document text
    • http://taberadajip.atwebpages.com/94188388497.pdfIn PDF document text
    • https://0aa989e7-076c-475f-bc22-fff5ae310860.filesusr.com/ugd/b44be6_fa17687655cc4280a91f2b4ce545df9e.pdf?index=trueIn PDF document text
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_ce1b3c9253da4f398d3c9d6932b9aa36.pdf?index=trueIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_6977467424fb4dd1b81c47c4ee74d786.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tinezedu/whirlpool_washer_f5_e3_error_code.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/carcassonne_city_map.pdfIn PDF document text
    • http://jugoviki.rf.gd/18903134641.pdfIn PDF document text
    • http://fatijilipoto.epizy.com/dowozezumeniw.pdfIn PDF document text
    • http://fiforeru.atwebpages.com/62946020128.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_off00016bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BDD 5500 bytes
SHA-256: f16c15806f3db53e3e32c11d06a6588607b126475f0596b5f0ff017c716f18d7
font_01_sfnt_off00017e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E83 12120 bytes
SHA-256: 395121595d414f6851966bb62a77b91f87be7d08e2cfe2f7ccdd59601dd00191

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