Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcaa8ab55712dc4d…

MALICIOUS

PDF

73.1 KB Created: 2021-09-19 12:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: db7f95434c4e29dd8be57bb26f0adec7 SHA-1: 335c37007c51239719ec3b2f25c7f55d7cac60a2 SHA-256: fcaa8ab55712dc4df45166f95e137a35d45edaee06ee82ce0d05a4855cdbe194
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to redirect users to malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a high volume of links on low-reputation hosts, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=obd2+chomikuj+android PDF link annotation
    • http://020tzs.com/baige/images/userfiles/file/94971216601.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/27296273205.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/69027854692.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/70995466942.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/fatesasabegeburadofebeke.pdfIn PDF document text
    • http://hobbes-group.com/upload/files/jevoboposomaxet.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/121285892.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/pobuwumaz.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/mibibexe.pdfIn PDF document text
    • http://aimic.com/userfiles/file/28976907014.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/wiwugezodeki.pdfIn PDF document text
    • http://polkovnik.su/upload/file/81889967414.pdfIn PDF document text
    • https://istanajp2.com/contents/files/85439844052.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/nupivadisu.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/wamimod.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/113227657.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/71006640307.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/9542937680.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/3611784920.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///kekutigedagoja.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/3666979778.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/7753f9e32d730a471849becfc73f299d/tebebapolidedexulofiluvaf.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/tujebumomokorux.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/21594852467.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_off0000c24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC24B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5D 14244 bytes
SHA-256: f43f7b6821f5c9fce02b3c93a6dc5b67453da49c5f4ba94626503a322f8afb4b
font_02_sfnt_off0000fe19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE19 10796 bytes
SHA-256: 191faef041f6fb5bd101307aadb57edaf197435af0a704c1dd1158468e8d3b88