Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d2f1840d864cf4…

MALICIOUS

PDF

76.8 KB Created: 2021-04-02 05:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 768e3584c40977b40a881e77b7e2f8ba SHA-1: 77d3a921afea004b0a59bfab042003b0c7c27149 SHA-256: 23d2f1840d864cf48ded7ff2a56def391755f290db59ecf98322453d3f2f3d07
126 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to external sites, some of which are flagged as unknown or potentially malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the nature of the document as a link farm on disposable hosting, suggesting a phishing or scam-related purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://midufefew.ru/award?keyword=frame+relay+concepts+pdf
    • http://pet-guru.shop/zuwokukofibuzibav5ekz.pdf
    • https://cdn.sqhk.co/matajikiwov/93LKhb1/the_labrant_fam_everleigh_age.pdf
    • http://pevazaw.mypressonline.com/69458362513.pdf
    • https://mazefitarunakur.weebly.com/uploads/1/3/1/4/131453858/bovuzivujuz.pdf
    • https://cdn.sqhk.co/widexerun/jMwXq1X/zupiriraje.pdf
    • https://cdn-cms.f-static.net/uploads/4365657/normal_60566fab1f626.pdf
    • https://cdn.sqhk.co/pewowutefiw/wgfmhdl/vazinusukuf.pdf
    • https://fisenekapiwu.weebly.com/uploads/1/3/1/4/131437930/turawu-medukuvowigexe-digebit-pezefudedut.pdf
    • https://cdn-cms.f-static.net/uploads/4452862/normal_6059abe86ba97.pdf
    • http://kukufimivote.iblogger.org/pdf_astronomy_magazine.pdf
    • https://tetomorefaboma.weebly.com/uploads/1/3/1/3/131384600/157673.pdf
    • http://xojanefod.mygamesonline.org/al_quran_30_juz.pdf
    • https://renobikedasel.weebly.com/uploads/1/3/4/8/134897329/50fbe460b41.pdf
    • http://wildber.store/how_to_remove_ninja_blender_handle9zkxm.pdf
    • http://sobakin.space/milonipegonesutuzorosvwze.pdf
    • https://cdn-cms.f-static.net/uploads/4414487/normal_601fa556968d8.pdf
    • http://vefijedos.22web.org/gowukagikav.pdf
    • https://cdn.sqhk.co/teketerep/lwibaid/moxesabuxugigifusutufom.pdf
    • http://dom-bita.org/odessa_tx_cdl_jobspxpft.pdf
    • http://oyuncuxx.com/vadejepobovogifenelphyo.pdf
    • https://vilujelirajoki.weebly.com/uploads/1/3/4/3/134378771/ad1235c5d994c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zupitatip.atwebpages.com/18361012217.pdf
    • http://veruzixiki.rf.gd/epson_adjustment_program_l3110_gratis.pdf
    • http://fatigovonid.rf.gd/gta_v_online_guide.pdf
    • http://pikazunelovo.epizy.com/vaxogaxewineg.pdf
    • http://fegoluvarelewum.myartsonline.com/fikotokoga.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_off0000ef2b.bin
b00613aa5c9228b76e08405507d30aeb0b58f6634b57d1cd29a9270a7aeffca1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2B 5360 bytes
font_01_sfnt_off0001015b.bin
58f178f9d7ba75cf2affdad52053fc94947978da2270839d0fd72d978f27b67e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1015B 10776 bytes

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