Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd6d319fa899e83b…

MALICIOUS

PDF

83.8 KB Created: 2021-09-20 18:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8c3c09bc8d9b95fbb7f2d1de71f43a93 SHA-1: 47cffcb84a3d90140946dfdca5252811a2f03539 SHA-256: bd6d319fa899e83b8f7f212e44312a0cec111cc5895f3ba2cf7ac3ac07e55e7f
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources hosted on various domains, many of which appear to be disposable. The heuristic PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM indicate a pattern of distributing malicious content through a link farm. The ML_NYX_PDF_MALICIOUS and ClamAV detections confirm the malicious nature of the file, likely serving as a lure for further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://clinicaveterinariamontecchia.com/userfiles/files/livelofazudab.pdf In PDF document text
    • https://jf-orvalho.pt/userfiles/file/73493851501.pdfIn PDF document text
    • https://85097781.com/upload/files/95477443698.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef47a36e4d---ganomixababivizefiz.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/raborekogixi.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/88093714839.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/81816818861.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/ladepujoduzefexur.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109161656012394.pdfIn PDF document text
    • http://attlas.center/userfiles/file/88011998592.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/kexadizu.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/xebopulol.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/lokabakatupoligoderaduva.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7a04f0b50---74610620321.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/tobuzosiwalefe.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/13548571520.pdfIn PDF document text
    • http://medi-sen.com/files/files/xitili.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/wunedewuvolozagijerigug.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/56017538428.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/59207996894.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/30508034491.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/rimaduxixobuno.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/sewafinowonedimurosimaj.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210913144917.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=friday+night+funk+apk+downloadPDF 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_off0000e422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE422 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC39 10844 bytes
SHA-256: 3160f557fd199ab33d422fb353b1ab4ba9de7079940c07d83b09ed37e76acab2
font_02_sfnt_off000114f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F2 17088 bytes
SHA-256: 8fbd0ca0bd070109be7523f5a46b8b60e25ee9b0fa7afc9335c425aae62677d6