Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4af9896edb2a83…

MALICIOUS

PDF

78.8 KB Created: 2021-03-29 20:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: facae8c352c191773236a9f46ec442b9 SHA-1: 333788718775d6f5d3d79e549d6cf41fd9504a3b SHA-256: 9f4af9896edb2a83d27c3e6a703d2054a8f80b52810e5c2e31477634be52bb47
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with a significant portion pointing to disposable hosting and potentially malicious domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/wix?keyword=kkmoon+gps+manual PDF link annotation
    • http://vujenixuwo.mypressonline.com/dirazulejosalezebagotewiz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390642/normal_5fe5803e96446.pdfIn PDF document text
    • http://teaitalis.space/kofejepewb4vfs.pdfIn PDF document text
    • http://badoxik.scienceontheweb.net/pengertian_apgar_score.pdfIn PDF document text
    • https://cdn.sqhk.co/pafevola/nGzhhgc/wesavedefetosexe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417992/normal_6041f304a7eff.pdfIn PDF document text
    • http://mufajaku.medianewsonline.com/best_answers_to_behavioral_interview_questions.pdfIn PDF document text
    • https://cdn.sqhk.co/vefoveted/Rjcifbe/5354719499.pdfIn PDF document text
    • http://fragcups.com/nogase022yf.pdfIn PDF document text
    • https://cdn.sqhk.co/rajexizeba/NlFij1w/rolling_stone_magazine_top_500_albums_list_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/kiraxozi/jijfygf/two_screen_desk_setup.pdfIn PDF document text
    • https://cdn.sqhk.co/noneniwetav/iEiap4x/jdm_cars_wallpaper.pdfIn PDF document text
    • https://cdn.sqhk.co/bavisimupux/9G6ghge/h_pylori_guidelines_2018.pdfIn PDF document text
    • http://summer-italy.fun/what_are_the_most_famous_rivers_in_francexf3vr.pdfIn PDF document text
    • https://cdn.sqhk.co/morexemodoju/bjchbN4/bed_bug_blood_on_sheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375515/normal_60609c57bf13d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lugimeviguv.myartsonline.com/sepse_neonatal_2020.pdfIn PDF document text
    • http://novogizeboje.myartsonline.com/wunenebufozatakuzuvula.pdfIn PDF document text
    • https://a82c121c-2200-4cd7-aff6-47cf910fdadb.filesusr.com/ugd/117c17_74cfe9a28e764a0e9b76c3b130fcd655.pdf?index=trueIn PDF document text
    • https://7be8961d-effb-4c78-a255-78c3c9f0be09.filesusr.com/ugd/3dd68e_5e7a439086894aa28c09c6fabfba929a.pdf?index=trueIn PDF document text
    • https://59b7e61f-9850-45ee-add2-e9646db267e4.filesusr.com/ugd/5b9365_4191d82f22674b7db8689c8389c65aa6.pdf?index=trueIn PDF document text
    • https://37e79482-e567-4eff-b449-6ea9b90d4679.filesusr.com/ugd/cff0cd_a7b5d826212f4439927ad117a0c26beb.pdf?index=trueIn 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_off0000f668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF668 5076 bytes
SHA-256: 8e76a215a6300c15b8de3f1374a2277be9769fd363238d1c717c3fe3736f5682
font_01_sfnt_off000107a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A8 11380 bytes
SHA-256: 3b6603472a155bfccc255ca9c1920fa0b219fbb4b99f4e511fda8c528f2bf6a6

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