Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cb650a4f1150740…

MALICIOUS

PDF

76.3 KB Created: 2021-02-27 00:15:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c6d142d416b3b473eab5e6bcd32a3931 SHA-1: a60b7fa3fa371c4042284d491e5874a4daef6826 SHA-256: 0cb650a4f1150740eefe58ac0722a02f1ac7e9fb41e9735fbfde721ad345eed2
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting, indicative of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

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 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://baarspo.ru/award?keyword=can+i+use+epic+on+ipad PDF link annotation
    • http://zikewexer.scienceontheweb.net/fulimodefejaz.pdfIn PDF document text
    • https://lolorude.weebly.com/uploads/1/3/0/7/130775760/wiponu.pdfIn PDF document text
    • https://jakoxizejibak.weebly.com/uploads/1/3/4/3/134348863/9593260.pdfIn PDF document text
    • http://wabukuxinezu.22web.org/97454667224.pdfIn PDF document text
    • http://kopuvimu.scienceontheweb.net/technical_elements_of_film_production.pdfIn PDF document text
    • https://xidekudogigut.weebly.com/uploads/1/3/4/6/134683706/ditozuxadojojiw_gexim_roniket_sipaserusagiwa.pdfIn PDF document text
    • http://robolab.one/73814328733v71s9.pdfIn PDF document text
    • http://zutatowatipo.mywebcommunity.org/orbit_model_57894_manual.pdfIn PDF document text
    • https://kisofoga.weebly.com/uploads/1/3/1/3/131383553/gatolonijavo.pdfIn PDF document text
    • https://dudobafileziv.weebly.com/uploads/1/3/5/3/135331993/c3d583d.pdfIn PDF document text
    • https://wotudopis.weebly.com/uploads/1/3/4/6/134679731/7605291.pdfIn PDF document text
    • http://mists.space/the_practice_of_statistics_in_the_life_sciences_3rd_editiony5x8m.pdfIn PDF document text
    • https://bazodezivif.weebly.com/uploads/1/3/6/0/136088162/c2e73d03a4.pdfIn PDF document text
    • https://panulozeti.weebly.com/uploads/1/3/5/3/135351273/rugebarapupavob-kitiwem-mupuro.pdfIn PDF document text
    • http://helps-lnstagramcopyrights-about.com/xegiburowipudiwugofo1zmd.pdfIn PDF document text
    • https://soxagunolipug.weebly.com/uploads/1/3/4/8/134887217/posizamujunedexo.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://xelidamos.epizy.com/arjun_reddy_bgm_in_320kbps.pdfIn PDF document text
    • http://zikefekumir.epizy.com/38484482512.pdfIn PDF document text
    • http://rapevuf.epizy.com/rt_ac66u_b1_firmware.pdfIn PDF document text
    • http://tafupudininidag.rf.gd/bir_form_2306_guidelines_and_instructions.pdfIn PDF document text
    • http://mudivakerimenog.epizy.com/dslr_camera_background_blur_app.pdfIn PDF document text
    • http://fusikisedote.epizy.com/48948120146.pdfIn 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_off0000e88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88E 4764 bytes
SHA-256: 022c00fd0a7c4b44d254dff47db7ec4947ab36d1085faf5b5036ae86d0715bd3
font_01_sfnt_off0000f8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C4 10892 bytes
SHA-256: 332fd206c17cad5c6d6fd14bcc51ee434a4d5a083650913c6497b8151ab08835
font_02_sfnt_off00011e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E13 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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