Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4c3e121291831d…

MALICIOUS

PDF

129.2 KB Created: 2021-05-02 10:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f7d1db70fcb86c6578c7fb2ba9f004e SHA-1: 7c5c31e228ea2a411305c0a8bb6fa6644f0d84ba SHA-256: ca4c3e121291831d81e8165c1f21ddd30b324fc135350f1ba150929fd254b9fe
186 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure strongly suggest it's intended to redirect users to potentially harmful content.

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://dafemum.ru/strik?utm_term=spinoza+ethics+part+1+explained
    • http://jojidasusesot.sportsontheweb.net/celestial_navigation_made_easy.pdf
    • http://jasazotinalol.mygamesonline.org/78049707720.pdf
    • http://wupunekum.getenjoyment.net/jidabimalavezazutobozava.pdf
    • http://omoikiri.info/over_the_rainbow_song_lyrics_by_judy_garlandm4la4.pdf
    • https://xobuwepowitapim.weebly.com/uploads/1/3/0/7/130775805/zuvopujifekodi_minisedim_rowolexinu.pdf
    • http://bibavovomid.22web.org/masemibawofufezu.pdf
    • http://winoraama.fun/weather_vocabulary_ieltsq25t6.pdf
    • http://ogranicbio.fun/msi_h81m-e33_bios_recoveryhu6by.pdf
    • http://zagavexakagin.mypressonline.com/anti_nmda_receptor_encephalitis.pdf
    • https://kufobuzu.weebly.com/uploads/1/3/5/3/135330794/wubanirili.pdf
    • https://tajamexuzoxobug.weebly.com/uploads/1/3/1/4/131410736/lajuwixosojuwi-gutujufelakajo-jufeleloro.pdf
    • https://sukaxivex.weebly.com/uploads/1/3/4/8/134895869/472818.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xefiposokupama.myartsonline.com/3501794793.pdf
    • https://77a48bbd-706a-45f8-a225-ac1cc02029d7.filesusr.com/ugd/3be48b_b3d34695fcbf4a4392d70e123be10471.pdf?index=true
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_47ee573d18284cd9abaa5cc65c277ca0.pdf?index=true
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_e629332c40514810ae312f2e0f96b184.pdf?index=true
    • https://d4e9107b-ea7a-46dd-9434-10729a3140ee.filesusr.com/ugd/2e3df4_713038c863ba4da183351dbd5f2a6e72.pdf?index=true
    • https://5a11eff3-0c7a-45dd-bb89-060d4d4d2060.filesusr.com/ugd/72216b_91d688b9769f48bf8819227c0b6a9571.pdf?index=true
    • https://438c9214-13ba-44a2-8469-a4c97ff43377.filesusr.com/ugd/5d46a0_329c37e905ce4227ba98b7ab5b86b968.pdf?index=true
    • http://tosizufokora.epizy.com/66423036846.pdf
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_8072247e1ef74e7797406d7d1f83678c.pdf?index=true
    • 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_off0001be46.bin
8beb91998e10f0ff70e167150c52dff55c553e46b02cfc3fe1e27836bcdd9e90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE46 5432 bytes
font_01_sfnt_off0001d0c7.bin
9fb4f6edfec8e6c2269de43aea8b87b9b63ffce0f6a651d1d181e13f1beb11e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D0C7 11424 bytes

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