Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb60ed512c925a45…

MALICIOUS

PDF

74.7 KB Created: 2021-03-23 01:18:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4e30678a07213113c493cfd9fee295a SHA-1: 16f96dcfb030407e02781d648df53a53be00d307 SHA-256: bb60ed512c925a45fa3ade0e1412f8e448015b562bdae4ed0fa0043df096d69c
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. The embedded URLs are the primary indicators of compromise, facilitating the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/award?keyword=most+common+suffixes+pdf
    • https://waxalema.weebly.com/uploads/1/3/4/3/134364729/5268345.pdf
    • http://nitapida.mywebcommunity.org/athens_vs_sparta.pdf
    • https://dunabosugetagek.weebly.com/uploads/1/3/4/6/134601841/d2ed910a50a4208.pdf
    • https://valezuxaj.weebly.com/uploads/1/3/4/6/134650604/jalalumozoxo.pdf
    • https://widonudafedezu.weebly.com/uploads/1/3/0/7/130776490/69e9a9237898c.pdf
    • http://sabovibin.medianewsonline.com/bsmrstu_admission_circular_2020.pdf
    • https://kuvitoguke.weebly.com/uploads/1/3/0/8/130813837/namurogajotemo.pdf
    • https://sujoxiwu.weebly.com/uploads/1/3/4/8/134879933/5692096.pdf
    • https://wuneregogituweg.weebly.com/uploads/1/3/4/6/134686440/kumagapab_dafalumobeb.pdf
    • https://nerutaraludu.weebly.com/uploads/1/3/4/6/134672403/e6334c50d5e73eb.pdf
    • http://mokenolovulonom.medianewsonline.com/curso_grua_autopropulsada.pdf
    • http://lebedugipul.mywebcommunity.org/ketafamepuselu.pdf
    • http://zoguponuwuxoli.medianewsonline.com/91701340867.pdf
    • http://noxaduva.mypressonline.com/trimble_access_general_survey_user_guide.pdf
    • https://webemibas.weebly.com/uploads/1/3/5/2/135298215/zarikokifenaz-wazoros-pusomepajira.pdf
    • http://lajafago.medianewsonline.com/fenuxifiviluda.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_63d49d1a37fc45ceaab6e7b312474d43.pdf?index=true
    • https://0ac950e2-707a-4e47-8bf4-daface0ea9db.filesusr.com/ugd/356f11_619ac7d4b5a34acba744d684d990f8bb.pdf?index=true
    • http://zotijoxamofos.epizy.com/mutorujopopuva.pdf
    • http://gabukinof.epizy.com/fesegegabojepasiv.pdf
    • http://notalopelovawu.epizy.com/ncert_physics_class_12_solutions_chapter_11.pdf
    • http://mozaninukokefef.onlinewebshop.net/87556295887.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_off0000eb37.bin
dafec89bdf7faca599f42963619575b2b380b8cd1e70431b3f4170243e93d1d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB37 5036 bytes
font_01_sfnt_off0000fc63.bin
0625c24f92193e1069ca1683ba7b48ae16cd088984cf33b85759e9f7acf6cffa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC63 9840 bytes

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