Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a27a75eab1f5fa0…

MALICIOUS

PDF

68.6 KB Created: 2021-09-27 17:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 671263a4cf99102ee80ee064c6b41a10 SHA-1: 99a152ce3b4f440517d4225268e3df83edb52514 SHA-256: 8a27a75eab1f5fa0bfda8057e846e173d424f9bc7d09310d10cf090b8c458e02
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://chcial.ru/uplcv?utm_term=block+launcher+apk PDF link annotation
    • https://flomogroup.com/upload/files/47147892030.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/43179436245.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/37815705864.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/lopigobo.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/15464162522.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/kujitafino.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/xekufakawavewa.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137308f7ad4a---wavagizaxuji.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/simijiba.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/fedokasadak.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/mesifilujavo.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/fezovamoba.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/72045414772.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/buvezakoro.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210902_233842.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/55372598744.pdfIn PDF document text
    • http://ranfeng.com/userfiles/file/2021-9///2021913857227777.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/tuvepotebukajonabiwazavo.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/63132836644.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/50840104773.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/41382868414.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6a00ab084---jenapepunumumamelani.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/ditogijodokexalusafokak.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/37181837164.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/59672187109.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_off0000afb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C5 14984 bytes
SHA-256: a2cf07a0c5620f8daa44136b74c5f702a1b1a17ef6777930ba53e1a919d7a8e0
font_02_sfnt_off0000edfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFA 10360 bytes
SHA-256: 7d0644834feba3386fe4a68c063908dd95c725e6f8e23ac408cf1c20a091fe4e