Malicious PDF — malware analysis report

Static analysis result for SHA-256 f921fe60291acd73…

MALICIOUS

PDF

76.3 KB Created: 2021-03-17 21:58:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 62860af941bb9e76a1603fabd1ed826c SHA-1: 5d06372469ed12e9d27b81b963cbeeca06fc894c SHA-256: f921fe60291acd733a9aba1d0535acb8b359798dfae29eaa69479346636e0232
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 trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and one prominent URL suggests a lure for downloading 'sonic apk free download'. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/wix?keyword=sonic+apk+free+download
    • https://jiliwadikejupa.weebly.com/uploads/1/3/1/3/131379685/7620060.pdf
    • http://kopumiwabetare.66ghz.com/79613227223.pdf
    • https://cdn-cms.f-static.net/uploads/4368741/normal_6032ab848ccca.pdf
    • http://liwitesuzemumex.sportsontheweb.net/star_realms_frontiers.pdf
    • http://lagidonak.mygamesonline.org/gagaruj.pdf
    • https://xewulowew.weebly.com/uploads/1/3/4/7/134757629/7972975d7fb.pdf
    • https://static.s123-cdn-static.com/uploads/4378834/normal_5fed689e04a6e.pdf
    • https://vujebitaj.weebly.com/uploads/1/3/4/7/134759162/e19f62890.pdf
    • https://gunesakozi.weebly.com/uploads/1/3/0/9/130968934/908834293ecb5cc.pdf
    • http://fejiximodanu.mygamesonline.org/20672761967.pdf
    • https://cdn-cms.f-static.net/uploads/4487647/normal_604d25f724502.pdf
    • http://bbbbbbbbeeee.space/af_kitaplar_indirm2iil.pdf
    • http://uber-global.com/nirewigosusuwgpak5.pdf
    • http://zdorovienashevse.xyz/8237639889olxyu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/45d6ac76-6ea0-4059-b6ab-1f8270e6612e/wemebofivupulibedobapal.pdf
    • http://luzutajezilako.rf.gd/multithreading_interview_questions_and_answers_in_c.pdf
    • http://lirurija.rf.gd/vornado_humidifier_stopped_working.pdf
    • https://uploads.strikinglycdn.com/files/f410b2f2-b976-4732-8e87-f4a705c846b5/temudabad.pdf
    • http://kuviwobabevi.epizy.com/what_is_the_inverse_of_a_matrix_3x3.pdf
    • http://reledolikivep.epizy.com/coulson_and_richardson_separation_processes.pdf
    • https://uploads.strikinglycdn.com/files/7127f73c-3341-4415-bc3f-206239d83689/die_unendliche_geschichte_film_wiki.pdf
    • http://pezamax.myartsonline.com/78621028918.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_off0000e821.bin
76030cda85a1a39eceec65317b1ee3b2d0c4fe184dc279cdb62c91a50ba57069		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE821 5228 bytes
font_01_sfnt_off0000fa1c.bin
fd5a35667151e56594fe4b6582bd8c9e67b0f44117e83243c46454e3287a3195		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1C 11952 bytes

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