Malicious PDF — malware analysis report

Static analysis result for SHA-256 57cb2e698ad73912…

MALICIOUS

PDF

81.0 KB Created: 2021-09-20 21:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: e526c4aa40c8e7a5b39ff870c3d69130 SHA-1: 4b60873f153983c2884fc928ac786a6d8fc14c08 SHA-256: 57cb2e698ad73912a597da979724430ef689561d5df2604417eb75fbe80cb8cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm used to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external sites, likely initiating a phishing or malware download chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=the+generic+strategies PDF link annotation
    • https://fratellifurloni.it/file/zowijokozapaxabob.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/xofofadarozarerimukusuj.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/bemapiwetirarixakoput.pdfIn PDF document text
    • https://loyd.rs/images/file/bobavakepijofaguziwoked.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/68904720758.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/poxuf.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/93863092137.pdfIn PDF document text
    • http://thecuriosityshot.com/86146629166.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/4841435315.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/91478753329.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/58916220411.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/dedajuvugin.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/mevajejijatoli.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/36500509408.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/xoriwunejavowizedi.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/solapetukagomufoleji.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/kefepodut.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/23cec57def1ecbece49bb204185306b1/27019981353.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/zafalonewevegezavag.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/36057764429.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/33179826253.pdfIn PDF document text
    • http://szm.hu/userfiles/file/puxel.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/29770668471.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2214405d4---97412475965.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021962048324223.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_off0000dae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE5 17216 bytes
SHA-256: 311032426b55b241dcea024236a16d29286680dc89f62b086f699ca3963eeb11
font_01_sfnt_off00010742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10742 10304 bytes
SHA-256: 7154086b9b5ada8eb6566f1ad8d1a2d7798991f97e0791d2de1f36172c81c143
font_02_sfnt_off00011e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1