Malicious PDF — malware analysis report

Static analysis result for SHA-256 e73f26f6ee15e8af…

MALICIOUS

PDF

79.6 KB Created: 2021-09-18 03:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5c3eb9c1ef68e2043522356281fec38b SHA-1: 04c447eab59bb629a69475294c1a8adde561b640 SHA-256: e73f26f6ee15e8af7fb52911806a3d8a1834497a9a53d19a049c718b6c044864
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous links to external domains, many of which are suspicious or unknown. The document body is heavily obfuscated, suggesting an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cowichanmusicfestival.com/userfiles/file/48958217380.pdf In PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/54657277101.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/32550386613.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/65537208521.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/kivebamak.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc47c223d4---91049150078.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/zepogoxadezozalenixuxo.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/75167082285.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/81977572.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/47320227700.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/bivozovuzowutirofip.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/22547832841.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/pozifovilaxilipij.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210910060115.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/tokuxakobizowur.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/kezufafe.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/d6hr1317r2k4e1ag2uq0rdrh6k/59080425049.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/sulokenanupizenizawuxafa.pdfIn PDF document text
    • http://nineslash.com/user_file/file/logokuwamaneloputizofib.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/5949834823.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/67312861608.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/91192204327.pdfIn PDF document text
    • http://hydrem.ru/images/file/koseropofubevaxuxuforimiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+add+new+google+account+on+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_off0000d304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD304 10556 bytes
SHA-256: 95d89dae600a61e69e2bf8d31479b6b8902d6e119c8b7cebd605205d7f64cf49
font_01_sfnt_off0000eaf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001030b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030B 17736 bytes
SHA-256: 088ca13deff0a6286a5d83e88b403a6cd5e698cf30b61c45e276b418984c16e5

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