Malicious PDF — malware analysis report

Static analysis result for SHA-256 59e2145a52c9cb58…

MALICIOUS

PDF

78.7 KB Created: 2021-04-04 09:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6fccc5627c70b9f2df2cf5d9bdefb3fe SHA-1: e12237ffdf497cb4d40728a53bf407d67d42aefc SHA-256: 59e2145a52c9cb582dad687b75ef262d2957e8d72d1e9d6ba48dfcfc25cdf909
126 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to reference 'Chicken invaders 4 two players mode', likely a lure to entice users to click on the embedded 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://vilenefex.ru/123?utm_term=chicken+invaders+4+two+players+mode PDF link annotation
    • http://vekisonoloze.sportsontheweb.net/40187791044.pdfIn PDF document text
    • http://agencymedia-ig.com/48188534494srzte.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368250/normal_6007c3fe98907.pdfIn PDF document text
    • http://jabewes.medianewsonline.com/febinujagesad.pdfIn PDF document text
    • https://cdn.sqhk.co/numovasovev/idDigNI/descargar_pewdiepie_tuber_simulator_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496616/normal_5fd7901456ce8.pdfIn PDF document text
    • https://cdn.sqhk.co/worenora/YifURGC/bread_milk_grocery_shopping_list_template.pdfIn PDF document text
    • http://befujukipepejem.mygamesonline.org/36041695582.pdfIn PDF document text
    • https://cdn.sqhk.co/movijomo/Ihdgdgc/22509194301.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/the_economist_february_23rd_2020.pdfIn PDF document text
    • http://summerita.fun/rilukojofajavojafew6uozt.pdfIn PDF document text
    • https://cdn.sqhk.co/werutojij/cjdigCb/pba_card_2020.pdfIn PDF document text
    • http://fepaporipevari.mypressonline.com/93725332391.pdfIn PDF document text
    • https://cdn.sqhk.co/molodomo/ijE5Wgc/rewudazuzufovivudiz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409813/normal_5fde856dada29.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452624/normal_5fcbca12a94b8.pdfIn PDF document text
    • http://helplnstagramcontact6088758.com/faluxebiwodasomad9x0l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444378/normal_6006beecc7529.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://firiwigisu.atwebpages.com/zowutesozegaguzorilarabo.pdfIn PDF document text
    • http://doriponesarom.myartsonline.com/how_can_i_have_a_purpose_driven_life_meaning.pdfIn PDF document text
    • http://tobikinos.onlinewebshop.net/come_thou_fount_chords_kings_kaleidoscope.pdfIn PDF document text
    • http://felugibesixe.onlinewebshop.net/kegimonadivipifijim.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_off0000f412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF412 5624 bytes
SHA-256: ea3b0acc2cf322b149d8d2c5f95c4a22cc5f99358425598239ed230708039d61
font_01_sfnt_off00010729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10729 11248 bytes
SHA-256: 390ef58569fb146b6f51489cd1f0d2d5aa1c0b2e4bc970060556f29e90d17dc9

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