Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ac0b61aefddc7e…

MALICIOUS

PDF

85.5 KB Created: 2021-09-19 09:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dae536a8413a16fdd76d9a1be040ced1 SHA-1: 0176aa60162782e6d98bb3a1dafb37d04039834f SHA-256: c3ac0b61aefddc7e23b203c376be341965e39082dda4ebf6dfa74bdd4ddc90af
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 external URIs and is structured as a link farm, indicating an attempt to redirect users to potentially harmful websites. The presence of embedded URLs and the heuristic identifying it as a link farm strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crysiq.ru/uplcv?utm_term=how+to+make+android+into+ios PDF link annotation
    • https://smartcirclegroup.com/userfiles/file/lufovikijil.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/nusikejad.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/87703892726.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/pimanukalolejefod.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/migipizivurinojefo.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/ziwowubekanevukodagaf.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/49767537133.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c4772e79a---19934377666.pdfIn PDF document text
    • http://xn--lenachatka-57b.pl/uploaded/file/zomepovemevopod.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/jobetusolovonaru.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/kivudewatu.pdfIn PDF document text
    • https://betsin.org/userfiles/files/zujopanufivefoxamizobejil.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/delogupusaxibanaji.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135e9c6812d9---zizekijelekujerekapoz.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/wijaxenagupogulerix.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/zisekifubotijajupogozoto.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/tomakovetime.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/87274582421.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/93630449713.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/fenerajuvonawejimilotipaf.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/gadiponidotexe.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/42789752788.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/xawuwexefofepuvolamadule.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_off0000e7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C7 18564 bytes
SHA-256: 1c8dec67afc13213112bbbeeed9897276a03c95d10ca641c03a4e8a975c1c291
font_01_sfnt_off000118d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E8 10532 bytes
SHA-256: 9a0814a294d45c121a0736aa6fe568ead665e1a08e86cdefbd989aecf393130b

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