Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fbfbf96ba62aaa9…

MALICIOUS

PDF

69.8 KB Created: 2021-09-29 09:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e398c8717d6b12671e2e57f05952471d SHA-1: b60dfe8c294d310ebdd77fa145af6cf5ae87c269 SHA-256: 4fbfbf96ba62aaa95f83eb2ef6c291a9a36a18fe72b650b2cc118881340e35ad
166 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, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The heuristic 'SE_LOLBIN_RUN_COMMAND' suggests the document may attempt to execute commands, potentially to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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=war+and+order+cheats+2021 PDF link annotation
    • http://itcck.org/upload/editor/file/fugodeviramiture.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/sisibutogep.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/18765989975.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/zisuzatomi.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/refelikebutajuleves.pdfIn macro / runtime command snippet
    • http://universalthailand.com/images/uploads/ckfinder/files/30514190658.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/sijokulilufenunesixorow.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/jolajopenuxu.pdfIn PDF document text
    • https://upaspor.com/resimler/files/mabovoxomunuwiroz.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/46963067126.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/dirab.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/nimatapigor.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/19967602182.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109170454139020.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/2745360315.pdfIn PDF document text
    • https://hinaweb.com/upload/file/fovipakunuv.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/torutuwijirozaferom.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/75979828466.pdfIn PDF document text
    • http://effekt-film.de/files/file/26418090915.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/53172968701.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/41665470590.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/86202303889.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/u4okdes462icrgunus19g5dm8a/77610330566.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/raxazazofedifipetar.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/47653894738.pdfIn PDF document text
    • http://nationalcoopadviIn macro / runtime command snippet
    • 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_off0000b1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CF 10616 bytes
SHA-256: 1f45da0db2b1910dfc053b24d92c86801e955e3b9a2c700d95a6baf30de4a1b5
font_01_sfnt_off0000ca23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE235 14772 bytes
SHA-256: ff56f79f6e83d1eaa87c98b66579a7d21c5d5fac8573177c95066846283cba8f