Malicious PDF — malware analysis report

Static analysis result for SHA-256 67d7f4cdc8b1d003…

MALICIOUS

PDF

77.4 KB Created: 2021-03-20 12:25:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 2f15ee62ff62e0d98d28e9c84cf71f7d SHA-1: f3d1d1e611013dd5322829be8b2c665fe172153f SHA-256: 67d7f4cdc8b1d0034fe62d0e850bb89cf102b4377d740e59ff8709f8ef4fa3e5
126 Risk Score

Malware Insights

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

The PDF contains obfuscated content and multiple embedded URLs, with one prominent URL leading to a disposable hosting domain. Heuristics indicate it's a link farm and ML classifiers strongly flag it as malicious. The presence of PDF_URI and EMBEDDED_URL heuristics, along with the ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION firings, confirms its malicious nature. The primary attack vector appears to be directing users to a phishing site disguised as academic notes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jumiwimov.ru/wix?keyword=apush+chapter+9+notes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443337/normal_5fe8285e39474.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444856/normal_600aa6fbb3300.pdfIn PDF document text
    • https://cdn.sqhk.co/muwizavo/ngigheb/54064536106.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412161/normal_5ff097f0459b0.pdfIn PDF document text
    • https://cdn.sqhk.co/wojinagimepu/gdhEdrs/difeluwelafizibovexas.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/jcRJjyy/fast_motorbike_rider_3d_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/Widhjij/61452691528.pdfIn PDF document text
    • https://cdn.sqhk.co/pimibopugugo/hfPC7hh/godakerokiragugapumo.pdfIn PDF document text
    • https://cdn.sqhk.co/bedogipaxog/bRdgfge/37983984411.pdfIn PDF document text
    • http://wuxevonatot.iblogger.org/gospel_of_wealth_significance_apush.pdfIn PDF document text
    • https://cdn.sqhk.co/bulixanejad/jMmjdwD/final_fantasy_xv_ps4_store.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_15ffa4336f54424280c48b7b3d7e8964.pdf?index=trueIn PDF document text
    • http://konojutusaxevik.rf.gd/arduino_uno_vs_mega_power_consumption.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/484827199.pdfIn PDF document text
    • http://vosimamasi.epizy.com/management_of_superficial_thrombophlebitis_nice_guidelines.pdfIn PDF document text
    • https://7980b0ff-2efe-48f4-a442-6c87bca80713.filesusr.com/ugd/9bd8c3_2561396330e441bba58f8358e76ee5ba.pdf?index=trueIn PDF document text
    • http://buwufofu.epizy.com/54497266369.pdfIn PDF document text
    • http://gonidiwofove.epizy.com/manorama_calendar_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/hepatitis_c_treatment_guidelines_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/project_portfolio_risk_management.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/carteles_informativos_de_animales.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/gorifixaped.pdfIn PDF document text
    • https://907864b8-ab38-4b43-b195-7646ee37c451.filesusr.com/ugd/c4b402_16970b1f8d8f462dbd65713c4dd633e1.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_off0000f1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F2 5132 bytes
SHA-256: 075ecf09c7134f3dad871ee4f5631e08e506e6063b02a689d1ceed5c4fed73a0
font_01_sfnt_off00010360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10360 10400 bytes
SHA-256: 77e21f30cea8562edefb2d298987db27e8f5ade8273f76bd2d45e59c408afd92

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