Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a28e6069afeb833…

MALICIOUS

PDF

86.7 KB Created: 2021-10-17 02:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5225c89c6e2658fc61491fff919ac3d2 SHA-1: 83d84f809640ee58dc508980faaae26ad1997147 SHA-256: 3a28e6069afeb8336134310168a29b8b443890ce6377f739205272ae7a47352c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high likelihood of this being used for SEO manipulation or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://karapinler.com/calisma2/files/uploads/tuxerubosubidobivu.pdf In PDF document text
    • http://miraesusan.com/ckupload/files/luxexujexunovewokoj.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/kadotefuxutas.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/40491888244.pdfIn PDF document text
    • https://maisonfamillesrimouski.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/sazejabibixawedogizon.pdfIn PDF document text
    • https://farsiherbal.com/cache/fck_files/file/gawixiwemomimurejamanulex.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/xoxigomapetoligon.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/94113941884.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/7488632324.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/wokivowejipibubanokisevuj.pdfIn PDF document text
    • http://dentherapia.hu/files/file/rajadolabibadozutozuv.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/pukiwazinowugog.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/tigosas.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/81217081911.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/nedejekobesirase.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20211006194640.pdfIn PDF document text
    • http://ortosprendimai.lt/userfiles/file/zedenukikubobuvut.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/alv38hdmohja8l34r08e0rvn90/wemudukir.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153d4daa88d8---92973268977.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/vopepikatifap.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/88728863699.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/78850853533.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/11552526291.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/gojijepisabovosiwil.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/u-9XGpgKpwY/uplcv?utm_term=what+ethics+means+to+mePDF 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_off0000f24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24B 10340 bytes
SHA-256: 820f6a85ad91d3d9a1c80bced281fbea26d395f9e7617d536db248793f5c94bc
font_01_sfnt_off0001097f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097F 17492 bytes
SHA-256: 4415a79d6a760aff45f42e76ae4c7403ddaa2cdf24da7514d83bd5789568ab76
font_02_sfnt_off00013509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13509 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1