Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e022ab0de6b6630…

MALICIOUS

PDF

70.9 KB Created: 2021-10-05 02:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 7b43f02dcc7245747c8c6bca134826b1 SHA-1: 8a736e4f4dcf85b32cbc45dfebc70ef3f6fbe962 SHA-256: 6e022ab0de6b6630994377e9020a03da0732929b98145865553e9ba05cc4a11e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous external URLs, many of which are hosted on disposable domains, indicating a link farm or phishing lure. The PDF structure and embedded content suggest it is designed to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

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://cructi.ru/uplcv?utm_term=effects+of+metabolic+alkalosis PDF link annotation
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/63857979797.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/36132935932.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/6302141646.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/jomelekerenolekus.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/befetufavifilaxa.pdfIn PDF document text
    • https://ver9.sonikgps.com/ckfinder/userfiles/files/4159656679.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/5622115476.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/62916876273.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/12752641549.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/15027202015.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/74287555519.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/27017467347.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/jiwunigozi.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/65475248104.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/kuzevejotaxew.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1614a2fb290d7b---nabiwinerul.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/99476592408.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/tekuzaxagonabamotedadoz.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/mobeluma.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/xotovapafupusijenunulek.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/pirigigatefe.pdfIn PDF document text
    • http://sparkpro.lv/content/file/xidebus.pdfIn PDF document text
    • http://headrepublic.pl/images/files/50913224044.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/najazozigebebozuxopafovot.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/72419513020.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_off0000b78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB78E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA5 10508 bytes
SHA-256: 56813d3de923b9e0ca2e223391e9fce37841fa0a8022cf41712ef66d81d2b881
font_02_sfnt_off0000e79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79B 15040 bytes
SHA-256: 990e855904850876821eea2515f16e8905877fa97dc97df1f5aa1762532253aa