Malicious PDF — malware analysis report

Static analysis result for SHA-256 799890a881716d8f…

MALICIOUS

PDF

85.9 KB Created: 2021-09-23 05:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e0b835cbe7e637e9020bed383313edf2 SHA-1: abe13e457b977b2d8c2feeec59299bcb0076b82b SHA-256: 799890a881716d8f26e94f30db85ef15e6249ebbbca556adf7b68b3d97a2de1d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=fortnite+mobile+games+android PDF link annotation
    • https://chsins.tw/uploads/files/202109151504159696.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/bijaxereboxofopebamit.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394414d7d48---42823060532.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/kejipiwarekiwali.pdfIn PDF document text
    • https://cv-vezouze.fr/media/file/97996293227.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/82177277798.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/85411703392.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/sakofabave.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/12651252927.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/wekezajipemidewopofe.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/taname.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/betadotoxosakabubemar.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/93800114896.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/sevofojuvarajakezu.pdfIn PDF document text
    • https://matrixx.lu/images/67566150325.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/57485085297.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148a77cb0120---77504320832.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/toxavugoseruratev.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/romesagiweve.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/puxududoworoletoval.pdfIn PDF document text
    • http://vntattoosupply.net/uploads/image/files/tijujugifebotilakijaleke.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/bixebepinijabaridajovatak.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/74147151512.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_off0000ea58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA58 18260 bytes
SHA-256: 58cd93c599735d843cd4b88d69f4600e3ebc20820c1519b7c7bb8f94797887ad
font_01_sfnt_off000119ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C5 10708 bytes
SHA-256: efd6dad473ce6a0f77eea0dd0ad2cf4537c81b5cb065e9de7e8f08d780177ed5

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