Malicious PDF — malware analysis report

Static analysis result for SHA-256 a24b5d9e3a4a2f7f…

MALICIOUS

PDF

78.6 KB Created: 2021-09-17 12:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 52b053eae14f9598b288a1a503c9266c SHA-1: 4dc182268cbd114dc1c34d5274dfc72e85cb5f45 SHA-256: a24b5d9e3a4a2f7f3b9340c2812c51554fc402f7442184c0254d984bf97257d6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various PDF files hosted on potentially disposable domains, characteristic of a link farm used to obscure the true destination or distribute further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34375595742.pdf In PDF document text
    • http://topoint.cc/userfiles/fckFile/20210906061907.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/firumorupufe.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/34795241017.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/xalapunetekod.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/zalewese.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/34744157053.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/28899411661.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/kelumab.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/f25bebc178e49acb9a0aa05920e8556c/lebusoboxu.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/xitusemubosidinazofez.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/butawoji.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/44390265374.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/33442474156.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/95113785497.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/nalaworufazos.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/24919319855.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/92996335207.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/vasudedifavolozaxebi.pdfIn PDF document text
    • http://apismorava.eu/docs/rabivojopafadumawefip.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/6242427164.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/37815491626.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/2439171302.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/31124699033.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/vabepufakekixedodafunudij.pdfIn PDF document text
    • http://lawngo.net/fckfiles/zepituvadab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=smart+led+price+in+pakistan+2020PDF 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_off0000cd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5D 10964 bytes
SHA-256: 1ab894ccf9d1f4e13a40d2aa6ab40901a0bf0674e6187732ce2c1f5ee50d23ec
font_01_sfnt_off0000e6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C1 17692 bytes
SHA-256: a6d08748a952fa89bb4c59a1fdd135fd7b9dcbf9ead2c0109232a2cbaced2d6a
font_02_sfnt_off000114b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1