Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f90822ddaec389…

MALICIOUS

PDF

89.0 KB Created: 2021-04-19 10:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 7d362540b5a11fd98bdb4f23fe665f64 SHA-1: 40cce146df4a2308bb69bf11b3395818accf4554 SHA-256: a1f90822ddaec389be26b2e85a8cf28a1632ea307fa9c91622579219609eb846
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The primary malicious URL identified is https://midufefew.ru/strik. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://midufefew.ru/strik?utm_term=scotts+lawn+mower+manual+1742 PDF link annotation
    • https://cdn.sqhk.co/pumafuki/ciciahc/zidaterobovufegujeg.pdfIn PDF document text
    • https://webunufilijamo.weebly.com/uploads/1/3/4/6/134677486/7763163.pdfIn PDF document text
    • https://dupagerenukuxat.weebly.com/uploads/1/3/4/7/134751723/mewoninixajilem-wilewosuvi-xuzimobesewi-nusarebepa.pdfIn PDF document text
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/2260490.pdfIn PDF document text
    • https://vawilateg.weebly.com/uploads/1/3/4/6/134697686/minorokiguj.pdfIn PDF document text
    • https://cdn.sqhk.co/fojilude/iglegje/the_maze_runner_book_ending_summary.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://guseboses.atwebpages.com/vavorokovomixorozete.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/letekodoruzofugisipomedut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f216b80-f546-4ce0-80d8-59687e7b8c40/77207668717.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/rizivitop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e188206a-8832-4b13-b7e5-849f806bdd5b/sonobugesowefovan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc4318db-5afa-4214-bc53-748cc1ff9092/venosezoj.pdfIn PDF document text
    • http://jelunegizubu.atwebpages.com/nigeria_christmas_carol_songs_download.pdfIn PDF document text
    • http://manosotidokef.myartsonline.com/getavejikawoka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a10a10c8-5d19-4120-b270-169ff54da1e7/legal_dictionary_english_spanish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b47f0a6-d8e2-4d70-bc9b-aad4e1fabecb/washington_state_basketball_team.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/where_to_put_clubs_in_cart_bag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e051e44-c003-403e-9cc9-5929ce606fec/avent_sterilizer_microwave_vs_electric.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/what_is_the_best_small_toaster_oven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ff416e6-9759-423e-a45f-877c76c5c2f5/xufokefokikilijegi.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/81571340975.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDE 5324 bytes
SHA-256: 132a5b6e56207b2e854483aca4b16fae5db30c231faa80a8c593d4be2f046bdb
font_01_sfnt_off000121f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F3 11336 bytes
SHA-256: 9be13383f1ef0e3c69f1464fcb1bb90d5baa8fc6983e2fe295dacb0848479e33
font_02_sfnt_off000148ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148AC 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f