Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cf36afce62790ff…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 00:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: eafb75229b9ae541a731baefdee37ce7 SHA-1: 3a526f9a685e58b758d743ea83ef45ae0bd0a22f SHA-256: 7cf36afce62790ff9e9dcf93cd559afd6b3c55c91281eeec2095d26da8babe2d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, with ClamAV identifying it as a phishing trojan. The embedded URLs suggest the primary goal is to redirect the user to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://cructi.ru/uplcv?utm_term=how+to+see+who+visited+my+instagram+profile PDF link annotation
    • https://efficimm.fr/userfiles/files/tipedavulefopexosu.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210923164833527.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/51816881201.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/gexadalabilibikusube.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/dosupamalozesataxelokuxo.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/db3e475e6a236f52f3a5ed679f59930c/xozabigika.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/pivibijetixazujeb.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/9a23c97a5b9bd4fcd3fda6132827cd63/23882186675.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/gawewolaxubefen.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/12511992879.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/rasobobuvafotuwelov.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/favusuwimiruresol.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/lubogurow.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/53791188608.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/fujejajubuj.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/37969512137.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/72167268580.pdfIn PDF document text
    • http://opsir.eu/files/file/22201602210.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/66467898868.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/xojewifuxinumudeti.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/58238232335.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_off0000b00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB00D 11200 bytes
SHA-256: 5486f82c5f80af43bba638ac10dba03c1ac266271f9138f53f6660fcad2b85ec
font_01_sfnt_off0000c9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EC 15444 bytes
SHA-256: 1536d9f7a8a10486ee121bb8b24bb999b92e22fd40e71bb1bf9d638d964e1211
font_02_sfnt_off0000f0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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