Malicious PDF — malware analysis report

Static analysis result for SHA-256 999e375f56da249a…

MALICIOUS

PDF

83.1 KB Created: 2021-09-18 15:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 36b3515f6ce68c3f59e13082431204e6 SHA-1: 109284e6962458a216af51b9381d4be1ca4c8477 SHA-256: 999e375f56da249a7d33a778b8e99ecddccf0fc77d58e745c1d956535398e67d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains embedded JavaScript, indicating a potential for malicious scripting execution. The PDF also acts as a link farm, directing users to numerous external URLs, which is a common tactic for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.petersonassoc.com/emailimages/file/limezafuworuboxijot.pdf In PDF document text
    • https://sportnazona.bg/f/uploads/files/xukoziwozogakeziwamokiv.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/49243200694.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/49853425197.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/wipexajugegu.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/53259968660.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/nutad.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/binupixovumivuvosarosaw.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0649168001631571805.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/27689959305.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/99757409914.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/sovopuwimilisalagivawu.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090716110724.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72816678891.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/nutom.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/17556281678.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/tolejuwolugixarigu.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/gosogovadoxo.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/63707876575.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161422841c950c---93617324710.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/pifevogulanebu.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f5792acec---77701776623.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/43060158824.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/88606301174.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/93607035364.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/rorupikobefafije.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/68527962194.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/81929859912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+set+up+sim+card+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_off0000e1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DA 16896 bytes
SHA-256: 9f782f83c3cdfdf25bc8269c00418367ccbc0dd2b746107d80a1ca4fdc60a66f
font_01_sfnt_off00010d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001254d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254D 10804 bytes
SHA-256: e614b6073c27beafba4eac8e7e93c90d0da78909161ab56b9dc07f707e2dc183