Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa66789568065732…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 06:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2c7b68f39505fe077d1592939ed12dbd SHA-1: 997774fefd92cd0ec194db230ec5e882e5c5573b SHA-256: aa6678956806573278c0cfeadbcf309fab69d72c4d1e1a6a108c25b7148f2e54
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of link farms or disposable hosting, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

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://wyslijpaczki.pl/app/webroot/files/userfiles/file/fegizobexezenezew.pdf In PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/15674169677.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613457e5ecb67---84051346049.pdfIn PDF document text
    • http://esangsok.com/upfile/files/bulizopurokirerefikega.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/16587476574.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/gegemagobabewezunatevufe.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/gisuku.pdfIn PDF document text
    • https://heureka-cz.eu/files/sobuwapuxugeru.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/xagevorudiwewugepobif.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/madozolimes.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/pirotegusodug.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210907192513.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/napisumusi.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/434088df0666480770f2f3d1c087eb37/44809940878.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/77222248267.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/wiwumowigelitekobobe.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/84733935455.pdfIn PDF document text
    • https://fong-cai.com/upload/files/midinepubizelem.pdfIn PDF document text
    • https://latework.cz/soubory/bosibojefatidamidefusox.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/37349917560.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/12743272306.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210906_021415.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/40508716266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=grammarly+keyboard+type+with+confidencePDF 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_off0000d775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD775 17332 bytes
SHA-256: ab1639b76c48ec4cf473380bfa9a138a39186d8dc9f5df3addd69e10e1b9ca07
font_01_sfnt_off00010488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10488 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9F 11188 bytes
SHA-256: 8772b2e8c7ef38337e17d1feb6e60c79018d6f82d8ae3fa3b9b9ee873152948e