Malicious PDF — malware analysis report

Static analysis result for SHA-256 828f46f4fd1a645e…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 18:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b955bcfd4298f07417fd8395f7a6c0f5 SHA-1: 342dbd0be7e6ca12ece88163b6d72afce32b9300 SHA-256: 828f46f4fd1a645ea9173d416891104b558e176b3ffcceac67b9ee59dd5af11a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically indicating phishing or trojan activity. It contains a large number of embedded URLs, many pointing to potentially malicious domains, and is structured as a link farm. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest an attempt to redirect users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://girilawfirm.com/content_files/files/fekumamomuzovosigodixivu.pdf In PDF document text
    • https://hitpoint.tw/userfiles/file/navevebetitilomevemadeku.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///fawajebisajevamo.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/64370768517.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/pudipemoji.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210906_02E0DC01FC6236F7.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/81820489951.pdfIn PDF document text
    • http://cpviettin.com/upload/files/52281611283.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/54416839590.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/13134423415.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/75903687831.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/xewumojelezubutumabije.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/4963149263.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/76464483557.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/3259916598.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/fitugedunitaxapikeje.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210914144800.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614599dbf0e7f.pdfIn PDF document text
    • http://medi-sen.com/files/files/puguziliwemewefigomi.pdfIn PDF document text
    • http://vln.nl/files/file/12563527169.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/14782668476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=streaming+gratis+film+2020PDF 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_off0000dc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC32 17432 bytes
SHA-256: 0efb423b5842645182fbabc1078abbf3d2f3536c3e6836166dc95bb56341371f
font_01_sfnt_off00010969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10969 10756 bytes
SHA-256: ebdb95113a18970d0118bd6b5adccec2fdeb2795a7181b33f219db286b367595
font_02_sfnt_off00012231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12231 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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