Malicious PDF — malware analysis report

Static analysis result for SHA-256 a12179e9da9c1e05…

MALICIOUS

PDF

71.9 KB Created: 2021-09-17 08:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 83690b9c093dcfc8906cbd9d1eb09986 SHA-1: d2067012cd0a0d608d37b6d9e87cda53922fc65f SHA-256: a12179e9da9c1e0566dea32f2d8ce3c6afc8592938b574d20e5c764c2daf89ed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a large number of embedded links, many pointing to unknown domains, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest an attempt to exploit users via these links, likely as a phishing lure or to download further malicious content.

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://szentimresiklos.hu/upload/file/bopugosok.pdf In PDF document text
    • http://thaide.org/userfiles/file/44401877956.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/dowowenugoxib.pdfIn PDF document text
    • http://minhanh.com/files/vufosetikolusa.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/131618098746.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/82073855329.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/20238176097.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/faboxajeludonodijidil.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/muwufuvosudozupo.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/debupufi.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/88707336272.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/dajidow.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/gixejipukunozasa.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210910210027.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/21912037416.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/98681545413.pdfIn PDF document text
    • https://kopari.hu/files/file/rozumutesa.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/99138531470.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/98760600703.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/livivebikizilos.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/10641820272.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec07582ac0---39817130219.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/kodulawojivirikogi.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/goxalutez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=entre+nous+2+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_off0000ba68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA68 10396 bytes
SHA-256: 5a8f7f3ea094397397b3700be0e0ee78651dc81f0a4e61c89685e3f2767e211e
font_01_sfnt_off0000d21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21D 16308 bytes
SHA-256: b045f30535dbefed005d9ad135f4c4bfb29d1396584f658d21b06c95df3fc1d8
font_02_sfnt_off0000fa2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1