Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b41e422a06016a2…

MALICIOUS

PDF

74.3 KB Created: 2021-09-18 09:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c88526c6394b42da1a444c262bf457e SHA-1: 3e67b77b9b1ac6fba3ccd11a4f796800653d9dc7 SHA-256: 5b41e422a06016a21a15a703918454a74dcd1f6ed7ce6e22dc6bf11e3516988e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host numerous links on disposable domains, likely to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://vanguardhungary.hu/userfiles/file/wegunew.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/2f08947f0b225c00d5f2d321b3d106b9/sijovorejamo.pdf
    • https://sindonis.com/userfiles/file/tiwunotenutev.pdf
    • http://ozdesignhouse.com/app/webroot/uploads/files/mudupemorekefogugowepu.pdf
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/nokopagobizakidezuseva.pdf
    • http://tw-tms.com/uploadpic/xw/files/pigodunemupusawidaliviken.pdf
    • https://solelane.com/ckfinder/userfiles/files/juten.pdf
    • http://mikailang.net/userfiles/file/20210902175040_548161179.pdf
    • http://officegate.biz/admin/fck_upload/file/favuvemujolew.pdf
    • http://studiomilano.eu/userfiles/files/99389987454.pdf
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/saruzap.pdf
    • http://orderkiwicafe.com/uploads/files/zatewifuvanevotug.pdf
    • https://warungmimpishio2.com/contents/files/1800104370.pdf
    • https://infotechb2blite.com/bot/ckfinder/uf/files/vamobakow.pdf
    • http://stroyvodservice.ru/upload/File/12326077659.pdf
    • http://ecohouse-lab.com/userfiles/file/32574026574.pdf
    • http://evevoyance.fr/adh/.-/file/66369894609.pdf
    • https://agrando.cz/files/file/toxetevibomujalixeje.pdf
    • https://arendic.cl/files/larupobavewadibef.pdf
    • http://alisawedding.com/upload/users/files/nofofazefusamewawefose.pdf
    • https://2acontractor.it/images/file/14608015144.pdf
    • http://www.bluefashion.cz/ckfinder/userfiles/files/82589201943.pdf
    • http://gorisum.net/fckeditor/upload_file/file/76433568264.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=damon+ps2+pro+paid+apk
    • 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_off0000bfc3.bin
24d149347878ad46ad64525b57f273a8bf3c249c4ea7dc671e886f2622fadf0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC3 16968 bytes
font_01_sfnt_off0000ebfe.bin
81a59b6478ae6223dee09ff0014678e57ca0989c6b1d04147fdfcd55f89e3c9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFE 10492 bytes
font_02_sfnt_off000103cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103CB 16792 bytes

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