Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cbfbc9ee627bec6…

MALICIOUS

PDF

107.3 KB Created: 2021-09-15 14:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3aaa2bd28a623fe9b39383a85d92319c SHA-1: 86ca20d98ad734b5fa4922d82c7ac1dbceef6378 SHA-256: 1cbfbc9ee627bec69061273ba3c6d227dd97f608207d77ec25c7c14b14318c1c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or redirecting users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users by directing them to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

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://synerhu.ru/uplcv?utm_term=7th+generation+ipad+price+in+pakistan PDF link annotation
    • http://daegyung.kr/userfiles/file/20210901060308.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/juderovomalux.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/xanirigutelisafulipiwuraz.pdfIn PDF document text
    • http://pk.mo/userfiles/file/2663811591.pdfIn PDF document text
    • http://designgaleria.hu/userfiles/file/mogona.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/xafakoxadafit.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/1988544406.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/pezefexokuruli.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109070256315753.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/lobimixap.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/63432184097.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/goxirepunu.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/26583936562.pdfIn PDF document text
    • http://csp.hu/editor_up/bokebidowa.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/48359279855.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/fapomigobimulajuwofuz.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/21174120911.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/7g97o349ml81sgf5b4b6uo5ri6/lopifiso.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/17927829196.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/falitab.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/22001038934.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/80653774580.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631131975_a01c603532.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/pukikesajofuwedonubisasox.pdfIn PDF document text
    • http://www.bandungmesin.com/file/51565308843.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/7bc8927ac42cdd248285fa986e2e2dcc/dinebalumuj.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000139dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139DC 10792 bytes
SHA-256: 313e0ee3f3fa764e7a17197d0fdcfa848ffa0426208c6eb173817bdaae4277ea
font_01_sfnt_off00015274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15274 20144 bytes
SHA-256: 5ebdf4a14fffd7bb3668090b9e024dd9c5dbf39700e9817bba32c06104a59fde
font_02_sfnt_off0001870c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1870C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1