Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa2bf1fe9c0dd9c…

MALICIOUS

PDF

82.6 KB Created: 2021-09-09 05:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c7e28bf03513df7ae53a9e55a6fa8afc SHA-1: ecf98ba92b8e02af74455c4bf5c4edffe2f769b7 SHA-256: 8fa2bf1fe9c0dd9cfde510bc0e3a79a444739521c251449a1626810492affbc3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to redirect users to multiple external sites.

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 https://pistant.ru/uplcv?utm_term=rename+project+name+android+studio PDF link annotation
    • http://cmrivestimenti.com/userfiles/files/mejuzuv.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/5027073822.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/tilusakifopakulufilibixeb.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/xeravejavax.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109042344283864.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335d7e8e7dc---42352819461.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/sukuduregosasigazi.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/tomedumigipokodogarodol.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/dusijutogewuw.pdfIn PDF document text
    • https://cityface.cz/res/file/63469801605.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/16810284434.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/95890100688.pdfIn PDF document text
    • https://turbooto.vn/upload/files/denefebelobag.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/zavojogotukodakawebaf.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/95768344460.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/47637813555.pdfIn PDF document text
    • https://conrays.ru/f/data/dulabidefinaw.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/6902789816.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/xatet.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/72585151897.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/88329703941.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/velenutimanuva.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/mivaz.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/69401007042.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/najokarozuxafozaxefu.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/zizabower.pdfIn PDF document text
    • 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_off0000dd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54B 17916 bytes
SHA-256: f974dbea29c9e34fc7c3d5f089512ec4a5894f550d79a8b990d538321742d018
font_02_sfnt_off0001237f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237F 10904 bytes
SHA-256: 9dec86c7398b35cffed02074f77a3606f552dbca22b93d0f83c51d79e1e87b0d

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