Malicious PDF — malware analysis report

Static analysis result for SHA-256 d00b1fe8bbc578f4…

MALICIOUS

PDF

76.7 KB Created: 2021-03-06 11:44:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df393c46ef6c2c2d16dee504b64e3f02 SHA-1: e2023d24c34941df3be3069e90a142b02b9d06c3 SHA-256: d00b1fe8bbc578f46032aa2a7879b3cd7fdcdfbb056d50342caccc012ca4fc59
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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-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://kuzutuzo.ru/aws?utm_term=how+old+is+clary+in+city+of+bones
    • http://kutatit.getenjoyment.net/makebabifugirejusudatuzi.pdf
    • https://cdn-cms.f-static.net/uploads/4372960/normal_60359f1361142.pdf
    • http://hookup682.site/what_is_the_bengali_meaning_of_cartesian_coordinate_systemxitkz.pdf
    • https://sijoxedewi.weebly.com/uploads/1/3/4/3/134346210/zuvefafegopan_bodup_wuvit_fobafek.pdf
    • https://static.s123-cdn-static.com/uploads/4420235/normal_5fc7771843d2a.pdf
    • https://raxorevowipafe.weebly.com/uploads/1/3/4/7/134765671/kojaz.pdf
    • https://wisetigu.weebly.com/uploads/1/3/4/3/134357320/fc0572.pdf
    • https://ximewenidurap.weebly.com/uploads/1/3/4/6/134651426/pavapaleretuxim_belexoxijojile_navifasemop.pdf
    • https://nemanuvipiza.weebly.com/uploads/1/3/1/3/131398236/mulewulis-noxodetozizuzop.pdf
    • http://timelessdecorum.com/don_juan_demarco_film_online_subtitratni9gx.pdf
    • http://xedeporib.medianewsonline.com/xijoxobawomojub.pdf
    • http://xafesuvorolivig.scienceontheweb.net/letra_en_espaol_de_la_cancion_7_years_de_lukas_graham.pdf
    • http://itdiscounts.info/86357922085a9v9w.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bitujiduruv.myartsonline.com/crown_princess_cruises_deck_plans.pdf
    • http://falalovoxiwada.epizy.com/5g_beamforming_ericsson.pdf
    • http://botusomiwa.epizy.com/tutufirowabalopejox.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_off0000ef11.bin
a6a43ff01ee290360722fc396e8c8a5d1aebb96128b141fd3fbdee6ee70ce495		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF11 5312 bytes
font_01_sfnt_off00010145.bin
6097c8610cf7be034b340e118d0cb28b1eddf5123f21ce377ebcd2716a9db19c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10145 10824 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.