Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa261e01f684ef7c…

MALICIOUS

PDF

73.4 KB Created: 2021-04-16 01:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c06ab87e5a6bbe1d8bf2111ccba96841 SHA-1: 296bd5959a82dca8443a3460937b4893a5abe258 SHA-256: aa261e01f684ef7cf8cb368c265e4b2a33244d416b441fbe1eb180eb6e3bf922
126 Risk Score

Malware Insights

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

The PDF contains multiple external links, with one pointing to a suspicious domain ('ponafet.ru') that is likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for numerous links, further suggesting malicious intent. Although no scripts were explicitly extracted, the presence of numerous URLs and the ML classifier's high confidence score point towards a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/strik?utm_term=how+to+calculate+flow+rate+of+centrifugal+pump PDF link annotation
    • https://lesavudipuvu.weebly.com/uploads/1/3/4/3/134338744/9b8317.pdfIn PDF document text
    • http://naliputa.mywebcommunity.org/mahadiscom_syllabus_for_assistant_engineer_electrical_2020.pdfIn PDF document text
    • http://vurujupafowutox.mypressonline.com/80788535090.pdfIn PDF document text
    • http://tadurarawi.mypressonline.com/48698108206.pdfIn PDF document text
    • http://refazali.mygamesonline.org/54080725567.pdfIn PDF document text
    • http://redofokotab.sportsontheweb.net/auditorium_design.pdfIn PDF document text
    • http://sokobumoxagug.scienceontheweb.net/zedogotegesipojasa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450507/normal_605d5d339a42e.pdfIn PDF document text
    • http://xigegojaliku.iblogger.org/kiduxatigizakug.pdfIn PDF document text
    • https://zetogamoxaten.weebly.com/uploads/1/3/4/6/134698061/pibufenijowifok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470526/normal_605983000fd4d.pdfIn PDF document text
    • http://zogedur.iblogger.org/peace_on_earth_casting_crowns_sheet_music.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zodotisejomiga.epizy.com/is_the_a_sequel_to_twilight_series_books.pdfIn PDF document text
    • http://fajazimigig.atwebpages.com/ap_budget_speech_2020_20.pdfIn PDF document text
    • http://dereduvate.epizy.com/stremio_beta_apk_free.pdfIn PDF document text
    • https://35057dd6-1d18-4acd-96c9-af3b7fddc7cd.filesusr.com/ugd/978dd5_f47008ece74b46a395458254ce8213b3.pdf?index=trueIn PDF document text
    • https://15319a82-8c66-4906-b3c2-464277991f2b.filesusr.com/ugd/070acf_33aff33bae914331a815cfaece023bfa.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_off0000e221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE221 5208 bytes
SHA-256: 7e6fce8ba1fe2f11a20375899ed53856c00ae0db84ff63ac26b5b9c02ae7b330
font_01_sfnt_off0000f3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DF 10616 bytes
SHA-256: c0844cf451d2adc4cd180233e9cc2c6aee90ce86274311e57124dcfb8fa211f5

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