Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc28db1128202f5…

MALICIOUS

PDF

76.1 KB Created: 2021-09-19 13:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bac8cc26c1386138a938252ade8a82e7 SHA-1: 5cb1df754450334e392fc621d987326d31f09424 SHA-256: ecc28db1128202f55234491548229b364041249ff29717956806bafbd5297b52
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous links to external PDF files hosted on various domains, many of which are suspicious. The document body is unreadable, but the heuristic findings indicate a malicious intent to redirect users to potentially harmful content.

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 http://erpsamik.com/ckfinder/userfiles/files/jajapaz.pdf In PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/rilunokuzomisuz.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/39807693144.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/94997271777.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/47878467606.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/10556688331.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de44b52a40---38913038278.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/xagilotunufigijij.pdfIn PDF document text
    • http://castel.lu/userfiles/files/98155918821.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/dce4ifu7ftpb62eilf09o747s0/zetedofuxomugogi.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/piwozakarinimibugelofoxes.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/belesinuxuboganilesoname.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/bepexagupo.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/64894720717.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/85550965116.pdfIn PDF document text
    • https://cristalensi.com/public/File/98621520051.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/matafifigasumiduvemaba.pdfIn PDF document text
    • http://reylab.com/userfiles/file/34826926712.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/jikigisewelal.pdfIn PDF document text
    • https://webmenuplus.com/images/file/tokolisebiriwesekoropamof.pdfIn PDF document text
    • http://smartvoicesys.com/userfiles/xuzijeduxuxulilinawixebe.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/viride.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210905033845.pdfIn PDF document text
    • http://labradory.pl/file/kafepukarevoxixapuzamipof.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/lirakidazinimajumija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=ubuntu+dual+boot+no+grubPDF 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_off0000c26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC26E 10276 bytes
SHA-256: c5224635e773cb183fd8d0c461226348ec933697869305f70030db3aff667872
font_01_sfnt_off0000d96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96E 18668 bytes
SHA-256: 6eb6fe63df594163d3c27afb4ba6de5c9f48e080a463e582ea6e98261c84b45d
font_02_sfnt_off00010b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1