Malicious PDF — malware analysis report

Static analysis result for SHA-256 be45818edf0589c7…

MALICIOUS

PDF

80.8 KB Created: 2021-04-26 22:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: faa478496a3e50c162e057dc3a8860c4 SHA-1: b2ff4957f0311fa984a2a1025ac699db9e197cc4 SHA-256: be45818edf0589c7a641aa09e68dcc79f702a27c93d7d4cb4d96117651412e5b
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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://ponafet.ru/strik?utm_term=2007+harley+davidson+sportster+1200+service+manual
    • http://lebojabufi.medianewsonline.com/23954304662.pdf
    • https://nilizexuv.weebly.com/uploads/1/3/0/7/130739046/zafigonisuxidav.pdf
    • https://nupureforisuro.weebly.com/uploads/1/3/4/3/134353583/zeruriludikugotu.pdf
    • http://bristol-yalta.run/kiforonilizulugopun99le0.pdf
    • http://ibkreactiva2020.com/cms_billing_guidelines_for_telemedicinejbtb0.pdf
    • http://wotaxatumumodok.sportsontheweb.net/ruxotipexugeken.pdf
    • https://xasatodifugo.weebly.com/uploads/1/3/4/4/134439571/5537955.pdf
    • https://ligonulijer.weebly.com/uploads/1/3/5/3/135318365/ximumujagate.pdf
    • https://negijozizur.weebly.com/uploads/1/3/0/7/130775009/kixasoje.pdf
    • http://cancandance.org/ganexuxulilisedaxukugepi59k88.pdf
    • https://fivujage.weebly.com/uploads/1/3/4/3/134316273/6816466.pdf
    • http://reveruverof.medianewsonline.com/historias_de_brujas_medievales.pdf
    • http://zevupixikug.mywebcommunity.org/3d_to_stl_online.pdf
    • http://kejumazinanu.mywebcommunity.org/36693377936.pdf
    • http://vclean-sale.shop/pumpkin_carving_template_disney6mmpp.pdf
    • https://finiruxadaral.weebly.com/uploads/1/3/2/6/132680938/b85ca71cd84c61.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://manutilo.epizy.com/adblock_chrome_android_tv.pdf
    • http://pidusagi.atwebpages.com/access_control_system_installation_manual.pdf
    • http://bibonajemag.epizy.com/why_is_my_fitbit_charge_3_display_not_working.pdf
    • http://jelunegizubu.atwebpages.com/dreams_from_my_father_free.pdf
    • http://kadizilurojiniz.onlinewebshop.net/38278504089.pdf
    • http://ritopagagibuxu.epizy.com/pofopopunigul.pdf
    • http://gilasorizarer.rf.gd/bloodborne_chalice_dungeon_progression_guide.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_off0000fc82.bin
178ac44f4d705c21ab63a3cbee0fb8d2280fce8db61717e2f9056fdff5c0dcdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC82 5788 bytes
font_01_sfnt_off00011023.bin
ae48ac9e696b84071500359776154e2a0383720162940715568db6006cf038d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11023 10920 bytes

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