Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b632d62e468737f…

MALICIOUS

PDF

78.8 KB Created: 2021-03-28 05:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 872065d0dc52ea2f9c763e9b67709fff SHA-1: 7f9e4af6d2200fcceccabf1658fd56b02d7f12b8 SHA-256: 8b632d62e468737fc6de98d3ab9077565e3f0b2fff47015e81c89b9423a34de5
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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=value+of+philosophy+bertrand+russell+summary
    • http://rulerezimatot.22web.org/wafigilokodulopokubo.pdf
    • https://cdn-cms.f-static.net/uploads/4368991/normal_6020ff1ae6ba7.pdf
    • http://mazers.fun/98704177217d4eqe.pdf
    • http://verification-help.business/trail_climb_hack_apk_1._20be144.pdf
    • https://rebodegumirimak.weebly.com/uploads/1/3/0/7/130775130/xifusigifodaletok.pdf
    • http://igme.site/meritnation_cbse_icse_more_free_live_classesz12lj.pdf
    • http://byseles.xyz/how_to_make_a_write_up_reports3p3q.pdf
    • https://bufitalusiwe.weebly.com/uploads/1/3/2/6/132682607/3174229.pdf
    • http://persequenteamsohbet.com/bluebook_citation_machineh4tun.pdf
    • https://pusiruse.weebly.com/uploads/1/3/4/7/134717846/859453.pdf
    • https://cdn-cms.f-static.net/uploads/4473619/normal_5fd1cc1fc8577.pdf
    • http://trellos.fun/jisovepgnhj.pdf
    • https://pikiravu.weebly.com/uploads/1/3/4/3/134347639/4833296.pdf
    • https://cdn-cms.f-static.net/uploads/4447097/normal_5fd28a5ca1495.pdf
    • http://xbet1.fun/instrucciones_cranium_cadoofl77m.pdf
    • http://meserowogawak.iblogger.org/eliptico_movement_perform_e3.pdf
    • https://wetegawufuju.weebly.com/uploads/1/3/5/3/135302163/mopemujirafugigeb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gateguka.epizy.com/classification_of_agronomic_crops.pdf
    • http://vitimalu.rf.gd/69711470670.pdf
    • http://pomigipasa.epizy.com/49495101357.pdf
    • http://vewemisesafi.epizy.com/africa_mapa_politico.pdf
    • http://jojomuge.epizy.com/3d_city_car_driving_games_free.pdf
    • http://revasaxoz.epizy.com/pasoja.pdf
    • http://wudumiwetoveri.rf.gd/causes_of_alcohol_addiction.pdf
    • 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_off0000f5da.bin
eff94696fea3eaa1ab7264e4e8b65f4ae6835657f9d0b8e130021d1fa2bf6cb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DA 5488 bytes
font_01_sfnt_off00010860.bin
fb1b09a14b5f9a70cf1d74f24e3a37220ec4466eb3c7b8b0129c39fd73b3b512		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10860 10896 bytes

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