Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3033863275cb34c…

MALICIOUS

PDF

70.7 KB Created: 2021-09-18 02:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fdb839e776ac0cb7b932384eb245e222 SHA-1: 294d5a8bb75589e02c5d60eff3801a58841c9be2 SHA-256: c3033863275cb34cdb090438d1d3d1eeb2e539c5a61ea1d137f8569e23a77e0a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of link farms on disposable hosting, indicating a phishing or malware distribution scheme. The PDF structure and embedded URLs suggest it is designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://infrive.ru/uplcv?utm_term=how+do+you+get+free+robux+on+your+phone PDF link annotation
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b62e7404f---fisijalonugeza.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/rulubabefuwovelubaret.pdfIn PDF document text
    • http://iviltra.lt/images/files/lepezilafawulalaw.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210912054819724490.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/lojofedisifenebekefi.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/17188895769.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/vogazilegowuperabawuta.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/42132609784.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/vixobusevowutelasijana.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/netezovigenodiwiranatun.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/21108102402.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/kujaxesuxupuxapolap.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/28875895661.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/bamemukavidodazimesare.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/88298081113.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/613fa7dfcec34.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/ruvupirelugozosewovepasej.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131595fe62da---84900953847.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/64476428842.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/31520927814.pdfIn PDF document text
    • https://shinaltd.ru/images/file/ropaz.pdfIn PDF document text
    • http://cga82.com/admin/File/8632614138.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/80099256247.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-3/20210903100419484931.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/90773582637.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_off0000b60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB60C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1E 15364 bytes
SHA-256: fc8ff572608ad39a9af7d0652639cf0a0ebe3e0dcb97af4e786fc1635f6bef1e
font_02_sfnt_off0000f4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DA 10844 bytes
SHA-256: 142b523a99d604afc09e3e62df0e3f8423ee1bde5472403cb4e3125207103953

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