Malicious PDF — malware analysis report

Static analysis result for SHA-256 2963a938307841a5…

MALICIOUS

PDF

70.7 KB Created: 2021-09-18 23:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8f57a943c05d824061d63048647ca714 SHA-1: 307dae5c9997021d631b50758529582b27911dcb SHA-256: 2963a938307841a577e03b176889efa04b37c9852a9bf3cb840e0b83dd129d54
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 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, with numerous embedded URLs pointing to potentially malicious domains. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://biosafety.biz/ckfinder/userfiles/files/24078732604.pdf In PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/moxifuxisuli.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/vepajawobagazuxetuwawo.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/nulas.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/donotirirepetumedoke.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/josobobisifozogelagele.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/97212513390.pdfIn PDF document text
    • http://hdg-gmuend.de/userfiles/files/71631650086.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/47638034188.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/gsf80fqher4speckkc295fh653/zipezarom.pdfIn PDF document text
    • http://kvrhousing.com/uploads/15552521559.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/139643402761304cf3973e0.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f103e027b7---lovezux.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/budegoriv.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/20654358432.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/pemiteruwixajaxazidak.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/36226905762.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/50311697948.pdfIn PDF document text
    • http://storemisr.com/uploads/files/pojovazelugaverutazak.pdfIn PDF document text
    • https://susta.vn/userfiles/file/39713956749.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/90367920316.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/ligebeto.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/rinozuwiguwotofefegorojuz.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/31497737404.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+update+my+tablet+to+android+10PDF 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_off0000b556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB556 10992 bytes
SHA-256: 747178fe1764460bb98a66e732592f5695d0d4032485df8866a0deb2ee4ad22b
font_01_sfnt_off0000ce95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE95 15352 bytes
SHA-256: 77a1f1e3c4af31bffd1140eef8303147ece72f1418cfb2fcfc4f0dbb6dd6bb49
font_02_sfnt_off0000f57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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