Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f84f7ce2396bc59…

MALICIOUS

PDF

76.2 KB Created: 2021-09-26 09:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3cba7c836988ef669e9b0f88a05dc717 SHA-1: fbf3601487c44fdec57d02fbd0c5fa64ed920ada SHA-256: 8f84f7ce2396bc590c9521cc9b0a1b6616da0f4f9021316ad7cfc408b66f1180
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=ben+10+comics+pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/xiwotibiguworugizoxu.pdf
    • http://tiwtactic.com/userfiles/files/1582976519.pdf
    • https://dtd.com.pk/ckfinder/userfiles/files/86899875912.pdf
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/toxaxovesekapipevobesulo.pdf
    • http://abcbyspu.com/ckfinder/images_store/files/mezozorujuno.pdf
    • https://rawoctane.com/uploads/file/90697593872.pdf
    • http://absolutelyneon.com/userfiles/file/46443386035.pdf
    • https://officialbacknumber.org/editor_up/keruxubukalanezo.pdf
    • https://ldoris.com/upfile/files/20210904035100.pdf
    • https://eyetracking.pl/userfiles/file/wesodidepawipu.pdf
    • http://www.almansori-ye.com/almansorifiles/files/pebinamatebasalekejegav.pdf
    • http://stapper.de/sites/default/files/userfilesfile/8377860634.pdf
    • http://indcms.testingmachines.com/images/file/40677423794.pdf
    • http://tomekorea.com/userData/board/file/sebavikukowen.pdf
    • https://crownprolaw.cn/userfiles/Proj_Name/files/rowuwopuriwojewuwite.pdf
    • http://honghuibio.com/d/files/3412123159.pdf
    • http://anhbanglaw.com/userfiles/file/zededojurekuduzokov.pdf
    • http://cngwalk.com/fckeditor/userfiles/image/15667287482.pdf
    • http://hz-karavany.cz/ckfinder/userfiles/files/josiligovaluvesaniruwufe.pdf
    • https://ndmoyun.com/calisma2/files/uploads/nasedovazijewoxoliniju.pdf
    • https://chungangroup.com/uploads/files/202109210631462280.pdf
    • http://kbchina.de/upload/31188847775.pdf
    • http://studioagronomoserragiotto.eu/userfiles/files/gijokawus.pdf
    • https://satellietgroep.nl/userfiles/files/kuberowezapokatipofax.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf21.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF21 16792 bytes
font_01_sfnt_off0000d733.bin
f4b4402bd487435b947798c108df64f539b40381d441fdb7ef639f77811f2022		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD733 19600 bytes
font_02_sfnt_off00010aee.bin
742b939abbbe2bd1390f70582470cd178c512ff5f7b9d71bc84dc1751d9fe7f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEE 10600 bytes

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