Malicious PDF — malware analysis report

Static analysis result for SHA-256 38bce74d15d2925c…

MALICIOUS

PDF

80.7 KB Created: 2021-03-31 20:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ef311d8ed3c3809e5501bd37c0e4ee5d SHA-1: e031bcbf8de67e480a556ee8a1bad19e52dfa028 SHA-256: 38bce74d15d2925c7199f334c7e1a43c06e9fae54516b4e45baca88187068f10
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this, indicating a tactic to obscure the final malicious destination. No scripts were extracted, but the presence of many URLs and the nature of the heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=bass+guitar+music+theory+pdf PDF link annotation
    • https://ninujesifig.weebly.com/uploads/1/3/1/4/131453022/7232826.pdfIn PDF document text
    • http://tumobizojelaku.22web.org/nefetoni.pdfIn PDF document text
    • https://cdn.sqhk.co/litonesi/VhfiiSf/epic_seven_wiki_haste.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475216/normal_5fcbbeb04a067.pdfIn PDF document text
    • http://durasazi.iblogger.org/how_many_books_in_the_sandman_series.pdfIn PDF document text
    • https://fukituxepuronip.weebly.com/uploads/1/3/4/6/134605821/jatubafanalo_xexenefuji.pdfIn PDF document text
    • https://pememeva.weebly.com/uploads/1/3/0/8/130874233/6168910.pdfIn PDF document text
    • http://zofozefevuf.iblogger.org/disney_annual_pass_benefits_2020.pdfIn PDF document text
    • http://xesebufawif.iblogger.org/skyui_error_code_5_reddit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401517/normal_6041c267ba685.pdfIn PDF document text
    • https://cdn.sqhk.co/rasetiwulipu/OsVhaia/bumper_cars_on_ice_nyc_hours.pdfIn PDF document text
    • https://doxemikawapuki.weebly.com/uploads/1/3/4/3/134314999/673159.pdfIn PDF document text
    • https://cdn.sqhk.co/vozaxodep/cdGjfX4/gin_rummy_plus_how_to_get_gold_safe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://volozixoxogibe.rf.gd/wadajifebukapilafimeneja.pdfIn PDF document text
    • http://vigexosav.myartsonline.com/49438730500.pdfIn PDF document text
    • http://nabenejajoko.myartsonline.com/html_to_php_page_break.pdfIn PDF document text
    • http://selofedibaxonal.epizy.com/saregama_carvaan_video_song.pdfIn PDF document text
    • http://fepesori.rf.gd/87909960558.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_off0000fcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDC 5688 bytes
SHA-256: 2a209c571b1f8f81e8dfdfdd3607c4d241f9922c4281bf0571bc7a9d8c2b141d
font_01_sfnt_off0001101c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101C 11168 bytes
SHA-256: 26ac9d256a2e941e1ccd2422668057bbae505be960cf9f8d8c99537111e241a5

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