Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a70ab823a5a215…

MALICIOUS

PDF

82.1 KB Created: 2021-09-14 00:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 68c3edaac4a34aaa4d34f9fcaaeb5dc5 SHA-1: 938afadd37aacd69fe07699e3fd2388ec939dc14 SHA-256: 18a70ab823a5a2156dd8462c4bb88bf8b108418b320b3ffbb18ace16e7d792cb
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF contains numerous links pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of multiple distinct domains hosting single PDF files reinforces the link farm characteristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/1ca6a3690b016fb863a4bdc1d8507e2f/zonokupukatisomedoro.pdf
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/bawuganajipebi.pdf
    • https://spa-salon.ru/ckfinder/userfiles/files/1672777084.pdf
    • https://letstravelforacause.com/miet/assets/files/69039517777.pdf
    • http://vanhacollection.com/images/files/67615323063.pdf
    • https://ccichn.vn/data/upload/file/xokitisedekoxoteguga.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbc2e8d26b---vowotoralomaremumip.pdf
    • http://adams-gold.ru/archive/image/file/rupor.pdf
    • http://norilskgu.ru/userfiles/file/4533225542.pdf
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/15823288302.pdf
    • http://aeusjtu.pretty-match.com/upload/files/31936990993.pdf
    • http://limobebe.com/userfiles/files/xajujojotegidorufumatafi.pdf
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/90200862749.pdf
    • http://iscelenie.info/files/file/fisigiwiwigirijekil.pdf
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/9684626285.pdf
    • https://marblobaths.ph/app/webroot/img/files/vamabajigerifotopena.pdf
    • https://www.willmarshelter.com/ckfinder/userfiles/files/23757847140.pdf
    • http://cloverdiamond.com/file/pekavu.pdf
    • http://candemdientu.com/Images_upload/files/tojawopuvepuwakasivunewu.pdf
    • http://sissonne.hu/editor_up/75410614086.pdf
    • http://lblussana.it/images/file/lavetubibopebafaforet.pdf
    • http://toanthinh.vn/webroot/img/files/11398458881.pdf
    • http://pensionpoint.cz/userfiles/files/diwajijeguzemivinibogi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=download+battle+legion+mod+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd65.bin
f5d73409153d7c645da9d7ad8c4d2a628396261f854743a4bf6bc06bb6e1da13
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD65 10784 bytes
font_01_sfnt_off0000f5ca.bin
68dc324d81bee734f8e7d00caecbb21ebc2038dd234df665aab5e5b2a5a414af
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CA 17292 bytes
font_02_sfnt_off000122a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x122A7 16792 bytes