Malicious PDF — malware analysis report

Static analysis result for SHA-256 44acd4e813a6a4c3…

MALICIOUS

PDF

77.5 KB Created: 2021-03-11 09:17:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 7254c8f9ee9143948a7fded75997faa6 SHA-1: 67e285dd5f7fa1415a7f0ff85443c769edba0ead SHA-256: 44acd4e813a6a4c33d71e1edf032f236646931f20fc524965f4729c4c6f40f2f
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one prominently featured as a search result for 'boy scout handbook pdf 2020'. This URL, https://midufefew.ru/award?keyword=boy+scout+handbook+pdf+2020, is hosted on disposable infrastructure, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=boy+scout+handbook+pdf+2020 PDF link annotation
    • http://wowogobofomufu.mygamesonline.org/nojuwawonozisejosodaboxub.pdfIn PDF document text
    • http://nupewijanetari.medianewsonline.com/z-table_normal_distribution.pdfIn PDF document text
    • http://ergors.space/lupifoxoparejnsjo.pdfIn PDF document text
    • http://xemizawufogutuf.scienceontheweb.net/32756663230.pdfIn PDF document text
    • http://dufifudusimube.mygamesonline.org/fiwaf.pdfIn PDF document text
    • http://lebepufu.mypressonline.com/fikojozepun.pdfIn PDF document text
    • http://zakomuxoza.getenjoyment.net/stampante_samsung_scx_4623f_prezzo.pdfIn PDF document text
    • http://pejalajumore.22web.org/how_long_would_it_take_to_walk_1000_steps.pdfIn PDF document text
    • http://rentline.pro/besilekaqin3d.pdfIn PDF document text
    • http://xawamiwupajev.mygamesonline.org/why_is_hp_printer_not_printing_black_ink.pdfIn PDF document text
    • http://luwogexejel.getenjoyment.net/67627003600.pdfIn PDF document text
    • http://ruwemipuwev.mypressonline.com/21620906293.pdfIn PDF document text
    • http://vosanulefatux.iblogger.org/rubusekufajaba.pdfIn PDF document text
    • http://phillipen.online/munchkin_cthulhu_cardsm32gs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wupokutixu.rf.gd/insinkerator_evolution_compact_vs_essential_xtr.pdfIn PDF document text
    • http://gumomexad.onlinewebshop.net/bolonofilamagupola.pdfIn PDF document text
    • http://biponutagovom.rf.gd/belekusevinokunipudi.pdfIn PDF document text
    • http://duliwijedij.rf.gd/ielts_speaking_part_2_tips.pdfIn PDF document text
    • https://c79fe1e0-2474-4600-ba53-c357956a86d9.filesusr.com/ugd/3835dd_c0b1b3eaf5dc4defa95be9ba53d89a36.pdf?index=trueIn PDF document text
    • http://bidejepeko.onlinewebshop.net/64280837669.pdfIn PDF document text
    • http://pajupevezujugut.atwebpages.com/how_to_pass_your_permit_test_in_indiana.pdfIn PDF document text
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_f7af53ce86ad4228828c884114f57383.pdf?index=trueIn PDF document text
    • https://4c6480a9-ccec-4c20-853c-cc48681c44ad.filesusr.com/ugd/935adc_3b067c7750574b658f092265d0f68f5f.pdf?index=trueIn PDF document text
    • http://maretubozewugi.myartsonline.com/sri_rudram_chamakam_meaning_in_tamil.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_off0000ef66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF66 5744 bytes
SHA-256: 79c2bb8e0baaef8198300888ea2aaf4f69eea80ed56250737fb108e042654af0
font_01_sfnt_off00010307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10307 11084 bytes
SHA-256: 4ade4ee29b4f39bcf4a48c68f6c998651b1fa362993f14eb00399e2e7e88935a