Malicious PDF — malware analysis report

Static analysis result for SHA-256 493df2fe36d15da3…

MALICIOUS

PDF

77.1 KB Created: 2021-04-02 08:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd21c904f16d89e3a06c3c2a91f80012 SHA-1: 793a201cbc11c6bd6ef7d3f80b5c6b4a8d25a705 SHA-256: 493df2fe36d15da3622df2d5e46e70bc0e9226973d501bc58d9db429557edb0c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm or redirection mechanism for malicious content. The document body, though heavily obfuscated, appears to be a lure related to a '2006 nissan sentra service manual', aiming to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/wix?keyword=2006+nissan+sentra+service+manual
    • http://wojurimaxab.mywebcommunity.org/100_free_online_to_word_converter_burger.pdf
    • http://theplafond.xyz/tokyo_ghoul_re_kaneki_wallpaper8be77.pdf
    • http://komaxinatobofe.medianewsonline.com/28875589219.pdf
    • https://cdn.sqhk.co/joxopejufito/hd1hegc/3522035489.pdf
    • http://mavogevuz.getenjoyment.net/53385057327.pdf
    • http://fuwiduwoxobol.mygamesonline.org/alkenes_reactions.pdf
    • http://xrootunited.com/tijejofx9xxo.pdf
    • http://vkysnaya-eda.site/stay_amelie_sheet_music_freeir06g.pdf
    • https://cdn.sqhk.co/letarezetap/gchdjaG/lolegafofapolad.pdf
    • http://tadidavazutopa.sportsontheweb.net/gagufabilodiwajox.pdf
    • http://2gusevshop.space/verizon_ellipsis_7_update_without_serviceehcmm.pdf
    • http://ponemofetu.scienceontheweb.net/95000168664.pdf
    • https://cdn.sqhk.co/rizuwevize/5Kgficw/33894478886.pdf
    • http://fibutogu.mywebcommunity.org/11116619095.pdf
    • http://dejivuxa.mygamesonline.org/glass_sword_twilight_forest.pdf
    • http://wejnpowk.space/starting_strength_basic_barbell_training_3rd_edition9flf0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mojenuj.atwebpages.com/xefasoxakugu.pdf
    • https://76c87692-cca9-4651-be8e-de6412dad411.filesusr.com/ugd/fdad67_a30cea3dea334017951685abe506b513.pdf?index=true
    • http://vawofirulev.myartsonline.com/84049067334.pdf
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_5d17ad0a9890466bb84108b780e95d99.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_off0000f05a.bin
3cecb512e3baa0f2319f05347a27f8dbf28141055394f6fbc62cf5ccde0e5514		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF05A 5336 bytes
font_01_sfnt_off0001026c.bin
f334894dffed0126ef7f7504452f1e47aae91d36f9c6e5056c43e1cdc2e0a5df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1026C 11100 bytes

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