Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea8436293777a4ee…

MALICIOUS

PDF

74.7 KB Created: 2021-04-03 06:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e0c25954942da317fcdcbb9e06cfb68a SHA-1: 516f38573e31487fa2a85352f28eb909f55f91a4 SHA-256: ea8436293777a4ee5d13d22fa2b933b74ee2dab0b83b146aa5cefba433d3b506
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://kuzutuzo.ru/123?utm_term=an+unfinished+life+imdb+parents+guide PDF link annotation
    • https://damemerivojed.weebly.com/uploads/1/3/4/3/134378109/kisigijadozimosumubi.pdfIn PDF document text
    • https://rutikaxa.weebly.com/uploads/1/3/0/7/130738846/gototogolewaf-gukobojokad.pdfIn PDF document text
    • https://cdn.sqhk.co/linewebozid/mjc0ghd/zukikosilafefub.pdfIn PDF document text
    • https://cdn.sqhk.co/vapelomusanu/7wPWggE/ates_ve_su_10000_oyna.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusetoteji/gO2geZ4/shadow_fight_3_weapons_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/wivenute/bpFfKhc/risk_of_rain_2_switch_cross_platform.pdfIn PDF document text
    • https://wotopegajoxife.weebly.com/uploads/1/3/4/0/134042499/5688403.pdfIn PDF document text
    • https://cdn.sqhk.co/muvasesuru/ahhgjlH/cheats_for_among_us_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/bimolixumotu/1rpmLhb/hidden_veg_meatball_recipe.pdfIn PDF document text
    • https://kelogukagikuval.weebly.com/uploads/1/3/0/7/130739039/276074.pdfIn PDF document text
    • https://gadogirunen.weebly.com/uploads/1/3/5/3/135347667/kekoliwo.pdfIn PDF document text
    • https://wosuletoxo.weebly.com/uploads/1/3/0/7/130739711/9156711.pdfIn PDF document text
    • https://cdn.sqhk.co/bajowekununa/ghdHGjh/captions_for_couple_pictures_in_spanish.pdfIn PDF document text
    • https://namazowofurap.weebly.com/uploads/1/3/4/3/134372349/8429199.pdfIn PDF document text
    • https://katabeguravaka.weebly.com/uploads/1/3/1/4/131407194/4dfc104ac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wepinipinalojud.epizy.com/mapiwuserevuku.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/approximation_questions_ibps_po.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/ajmer_video_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/xeninagekekener.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/nexenofujipununa.pdfIn PDF document text
    • http://dijovomivuz.rf.gd/66503868384.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE410 5584 bytes
SHA-256: 2b829796152bf464e57af20f279d0aa86e47b9a54f688c64e8077b6229b988ff
font_01_sfnt_off0000f6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D8 11580 bytes
SHA-256: e85f88ec0082043301d7ac44372deb8bdcdb0cd7824a888cbfb38d3668563761

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