Malicious PDF — malware analysis report

Static analysis result for SHA-256 67ba5eeb8cd8451f…

MALICIOUS

PDF

79.2 KB Created: 2021-03-08 23:28:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2407eca6d095c4cb945257c072a7f878 SHA-1: 9f96d03932487c783aba1aa22637c391c343eacb SHA-256: 67ba5eeb8cd8451f06faff6514d659e143552ab49f4ec6005414ef43ad08470a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to potentially malicious domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to external content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=how+to+thread+a+kenmore+12+stitch+sewing+machine+model+158
    • http://prizinsta365.online/lexus_es300_headlight_replacement3wumd.pdf
    • http://shlifovka-pol.website/795363998350ci0k.pdf
    • http://carinsusa.com/handwriting_practice_worksheets_ks2_free_ukz7dlp.pdf
    • https://wijirejilape.weebly.com/uploads/1/3/2/8/132816202/b9b5f5.pdf
    • http://kuzojud.66ghz.com/lightroom_presets_free_google_drive.pdf
    • https://bipufufutugudov.weebly.com/uploads/1/3/1/1/131164095/metizusexo-raxewigulodu.pdf
    • http://ukranews.site/sterile_tile_rimworldv5ui9.pdf
    • http://taygerr.com/munevewuvikoxiponuvurapolpmcgp.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_6fd1a2736582420888fb368ae8bff4c6.pdf?index=true
    • https://s3.amazonaws.com/kibavutibeved/format_of_caveat_petition_in_high_court.pdf
    • https://s3.amazonaws.com/xakajoziwibi/85557765470.pdf
    • https://s3.amazonaws.com/kibavutibeved/city_of_thieves_full.pdf
    • http://kovemipenege.rf.gd/vyond_animation_software_free.pdf
    • http://bixodog.rf.gd/jojegafumaguvumasisoxoko.pdf
    • https://37bcb4aa-7747-4ff6-a352-0e22bf983c21.filesusr.com/ugd/4393d3_0a77f7b5c35d4e68a4b2c397be746338.pdf?index=true
    • http://gewipupegikamu.epizy.com/density_regents_questions_worksheet_answers.pdf
    • https://s3.amazonaws.com/wemupajese/number_tracing_worksheets_free_printable.pdf
    • http://natutepop.epizy.com/36178830444.pdf
    • https://s3.amazonaws.com/baritexovopa/21571016262.pdf
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_e1b970856756462fa0700d636553bc59.pdf?index=true
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_8343423951c24943a574302011cd415f.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f730.bin
ba7162818a62154f677769bd59a4678a9d4c9c995e5cab00c32c9148f21092b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF730 5972 bytes
font_01_sfnt_off00010b74.bin
301541a86a1dd8bd14963387870687dfc07f9f461687eb14b55431c09300b772		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B74 10520 bytes

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