Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3043ea5a1362a3e…

MALICIOUS

PDF

79.4 KB Created: 2021-09-11 00:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 98fc99d2c3eef89c31439cafd1f6ba8d SHA-1: 0b4bb9c5e1ab2a76e084460b7963370ae0cac17a SHA-256: f3043ea5a1362a3ee879354f04a55957e30fbaa5b30c34f8a3659aeb22a34090
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The PDF contains numerous embedded URLs pointing to various domains, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://queure.ru/uplcv?utm_term=use+tablet+screen+with+raspberry+pi PDF link annotation
    • http://allprintusa.com/admin/images/file/27006886719.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/66988960104.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/8176044169.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/59339528919.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/ata4nvk6vd3nol4d5h5uej11d0/kuwuvibawepenodu.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/68974951321.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/zutufeke.pdfIn PDF document text
    • https://tonitomov.com/picture/file/wajekodakomizam.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/dotatokaxabezope.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/48862617219.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/94491927675.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/36622664935.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/fevigebipelakalimuf.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/30594363600.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/6291530848.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/1006432544.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/tutukeputojojim.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/vurepazat.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210902155016.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613719dd36214---votukisiwaregola.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/xuditesadip.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/gutikutatimefanex.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/gojofodemug.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_off0000d1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DA 10696 bytes
SHA-256: 592b592cdb69a256b1d9bfd104324ee429d655cef8cad110617cd85bfd8dcf48
font_01_sfnt_off0000ea2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2E 17648 bytes
SHA-256: cc015c83739206d572d9fcfced621487809ccb84f6a8431415e022776b78198f
font_02_sfnt_off00011819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11819 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1