Malicious PDF — malware analysis report

Static analysis result for SHA-256 4100b9f8f0a56ed0…

MALICIOUS

PDF

75.7 KB Created: 2021-09-28 14:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2fafa4e351db07f20a663e076378fd68 SHA-1: 725f17c07df0faf5ebe4a6254dcd82bc0344e67c SHA-256: 4100b9f8f0a56ed0aa211c0b025c6fe04dcb67814028010a796b0836630ec51b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://archism.ru/uplcv?utm_term=highly+compressed+gta+5+for+android PDF link annotation
    • http://kxzyjy.com/CKEdit/upload/files/zegidakewop.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/tijefajupitokepamipu.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109271422143583.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/79212909851.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/tagok.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/moxokugejuvaxutajisibosir.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/vutukuv.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/37400501916.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/fatagit.pdfIn PDF document text
    • https://merlak.ru/userfiles/file/92940052699.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/vawazukusotowixerej.pdfIn PDF document text
    • http://1111.morefriendship.com/upload/files/44544952249.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/42159242478.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/27425276317.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca5f13256d---13294362636.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210916044647.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/97297574304.pdfIn PDF document text
    • https://webhosting4.net/media/file/sorivotafisazurita.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/vezojivanalemolor.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/nivumunozavesod.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/gorifedexojukufodukexanan.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/58482706147.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210905223657.pdfIn PDF document text
    • https://tuinvandecruys.be/file/zapemutixorefosali.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_off0000be7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD690 18528 bytes
SHA-256: acd4e79d1c729b96a5248513fb06855d15c5c789ffcca4a6cca4b6b237579738
font_02_sfnt_off00010727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10727 11304 bytes
SHA-256: c247ede99b86143504c025c71fc0623d52d04491f82078c03bcfd766c456dbcf

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