Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f0ec1ba45bd6a6…

MALICIOUS

PDF

98.5 KB Created: 2021-03-28 22:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36006089aea34f4addd783b87482d7b5 SHA-1: aaa5b9c5697b6189f6279eafd4154ef17f11fdf9 SHA-256: e8f0ec1ba45bd6a63a29998b8ed2fc97a4dd4dea545ab271f4b9bb465ede8a02
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting a link farm or phishing operation. The embedded URLs point to domains that are likely part of this malicious infrastructure, aiming to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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
  • 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://resalured.ru/wix?keyword=ti-83+plus+manual+espa%25C3%25B1ol
    • https://cdn.sqhk.co/nomelafu/liegeFA/lujevolafazotezolo.pdf
    • https://zovipimisog.weebly.com/uploads/1/3/1/1/131163747/1ff0a2e72cc55c6.pdf
    • https://taxefijiduru.weebly.com/uploads/1/3/5/3/135311915/1681198.pdf
    • https://kamukijupekud.weebly.com/uploads/1/3/3/9/133997827/jedepozejawok.pdf
    • http://zaxevef.getenjoyment.net/jetavokoserugu.pdf
    • https://vusubidasezojix.weebly.com/uploads/1/3/5/3/135399418/0cd703e95f1e4d.pdf
    • https://cdn.sqhk.co/ruvonusebex/jggi7hc/checkers_hours_of_operation.pdf
    • https://cdn.sqhk.co/vevigagexoxa/zOhf3gi/kozunizusivela.pdf
    • http://bisapusid.mypressonline.com/84851270025.pdf
    • https://cdn.sqhk.co/rubekafux/jjihKsn/k_yamet_kombat_arena_apk_indir.pdf
    • https://cdn.sqhk.co/mafowixodi/0gehcjd/best_wallpapers_for_samsung_s10_plus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/fadedosi/65921393959.pdf
    • https://s3.amazonaws.com/remuv/aspire_3d_clipart.pdf
    • http://doriponesarom.myartsonline.com/nozanilefopedekadanuxire.pdf
    • https://s3.amazonaws.com/pukaridimupo/handy_seamless_transitions_v4._6.pdf
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_935e193d3e95487a9dba3b6b6e541085.pdf?index=true
    • https://s3.amazonaws.com/rejiner/28644112819.pdf
    • https://s3.amazonaws.com/wuwabobujasivor/29913395311.pdf
    • https://s3.amazonaws.com/wozoxub/lithium_bromide_water_absorption_system.pdf
    • https://79c9c32e-6572-42fd-9c0e-61d057d48a34.filesusr.com/ugd/33a1c8_dd64340899574f698b7d92cce5cb3048.pdf?index=true
    • https://s3.amazonaws.com/lebejos/modern_family_season_1_episode_22_script.pdf
    • https://s3.amazonaws.com/lakujusitejojet/steam_workshop_cs_go_skins.pdf
    • https://s3.amazonaws.com/jevedijadiki/berthold_akzidenz_grotesk_light_italic_free.pdf
    • https://s3.amazonaws.com/bulikowexunepov/dejano.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012b50.bin
fc2ca24404eec5d144bc6adfb5989dc2ae4a30d293960f58b09a08dffa8b4602		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B50 5220 bytes
font_01_sfnt_off00013cb2.bin
96b85a9e0c4860ad054533461b996216f95bd2944a731a3bc22671d677c3ec97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB2 14976 bytes
font_02_sfnt_off00016c99.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16C99 4324 bytes

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