Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d55d971bc59e8f0…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 12:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 77027aaaaaeecf33979b1158ff1e04af SHA-1: 5f028c6a11a72f13f36be9ff2cec6f9378ba0dbc SHA-256: 6d55d971bc59e8f04f13e74bc60bbb4da9bb98ac2e2b5be098ff1470fe6753ce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to other PDF files on distinct domains, indicating a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic to obscure malicious intent. ClamAV detection and ML classification confirm its malicious nature, likely serving as a lure for phishing or to distribute further malware.

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 http://hqshop24.com/userfiles/file/kakabimagomizi.pdf In PDF document text
    • https://qian-ho.com/upfiles/editor/files/kipagepuvanewomo.pdfIn PDF document text
    • https://dm288.com/slicice/file/mowufekejaxuxaken.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/63641642870.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/jajotofokiwatamavil.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/33758336597.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/51427294828.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136fdafe8757---12170278461.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/76114155140.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/876908018.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/jemejefipanufepagir.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/mimijuzowaziti.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/puvivonoras.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/lojim.pdfIn PDF document text
    • http://poliinc.com/upload/files/taluzidu.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/wuwufesonasev.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/jewokiwo.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/fuzag.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/43901548234.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202192919518937.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/totidadefewajenolagurefum.pdfIn PDF document text
    • https://viettrungson.com/media/Files/nirelikotagarufenikosu.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5f8345f73---vulodowegelamopobikobujel.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/32612816029.pdfIn PDF document text
    • https://derfo.info/resimler/files/bexalutubumixelitu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=acceptance+letter+pdfPDF link annotation
    • 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_off0000d9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F1 17932 bytes
SHA-256: 616fa545b8d53575932f0b3500288fc7753ae0b1473fbeae83997a1fb1f7b5ef
font_01_sfnt_off000107e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF9 10212 bytes
SHA-256: 046869b205f73a703b07d17c56e542e55fc78c80b32ba0473893303a48946138

Open this report in the interactive analyzer, or submit your own file for analysis.