Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c2e7d75e032b33c…

MALICIOUS

PDF

79.3 KB Created: 2021-09-24 05:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f20762494f2096ca1cb78e17a736023b SHA-1: 477e89c091b78ca046f76c97e9c5bef89e0f185c SHA-256: 5c2e7d75e032b33cc30b273212294f2a654e032a5fc52acdd8fa041a2f8e1420
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristic firings indicating malicious intent, including random URL links and being part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest maliciousness. The embedded links likely serve to redirect the user to download additional malicious files, a common tactic for phishing and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://giovanniseneca.eu/userfiles/files/41446915982.pdf In PDF document text
    • http://bfcy88.com/uploads/files/4217380369.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/rujezunudazezabigevoju.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/jubonupukufopeji.pdfIn PDF document text
    • http://ambulatorioveterinariosanfrancesco.com/userfiles/files/xifeme.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/96718185571.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/b26422a442998bfbb3217743b1295aa6/sunumujovorapew.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/lusara.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/94853921833.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/50958437998.pdfIn PDF document text
    • http://mfahk.com/upload/files/nolomovuloruzim.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16134868bd5751---36139432663.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/93471851036.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/34328810040.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/xidefewawa.pdfIn PDF document text
    • https://priscar.com/documents/files/sasadapi.pdfIn PDF document text
    • http://kasargod.net/uploads/file/31575196212.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210923_BCBAE64BCFB817FA.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/34304465406.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/63903317634.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/39364402643.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/nonanurafabekivarapit.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-22/20210922034531813374.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+merge+2+videos+in+androidPDF 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_off0000d365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD365 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB77 16704 bytes
SHA-256: 5d2b870da9c45a22eff4e1125e4aa8508cedfd58d75ec83ecc51700685301b76
font_02_sfnt_off000116cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CB 10808 bytes
SHA-256: 92481ad64a92b6c615e028e5567a9fbc8b3ba84c1c342fe47cdf53f42096d3b6