Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8102af5cf703dde…

MALICIOUS

PDF

71.2 KB Created: 2021-10-03 10:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04a8a8e0b2eb011558a906d27fe0d4a8 SHA-1: ed5127ce5d4fb7cd76c067c98f0192e39c8f86bf SHA-256: e8102af5cf703ddee0afd55e02560ec157aeb605441701eb9a21c3d2c82b8604
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The PDF contains a large number of external URIs pointing to disposable domains, indicating a link farm designed to distribute malicious content or redirect users to phishing sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://thueotodn.com/uploads/image/files/kivagixajapisoxojawikiva.pdf
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631706650_b5ed5bbd63.pdf
    • http://softwarefactory.nl/images/file/80821491408.pdf
    • https://zippy-inc.com/app/webroot/userfiles/files/nuvubowukujuwep.pdf
    • http://tageedesign.com/ssmpt/documents/file/jurol.pdf
    • http://www.abcklima.hu/data/editorfile/fidot.pdf
    • https://printjet.pl/pliki_user/File/40287083660.pdf
    • https://refakatci.net/userfiles/file/pexozasame.pdf
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/geziduvatabipakorozivo.pdf
    • http://njbeihang.com/uploadfile/file///2021090415544724.pdf
    • https://euforbiabulgaria.com/uploads/pages/files/gukemepumufasen.pdf
    • http://gabortech.com/admin/file/gofugalufosesep.pdf
    • http://miass.realxenon.ru/uploads/files/gasinifobadebix.pdf
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/83679773519.pdf
    • https://peiitw.com/Upload/ckeditor/files/13688792391.pdf
    • http://dgjst.com/upfile/file/lujagodalok.pdf
    • https://buonoantonio.it/userfiles/file/1556515464.pdf
    • http://www.centralperdana.com/file/nugepepulebuzamisiwevepu.pdf
    • http://coomargroup.com/ckfinder/userfiles/files/51731181396.pdf
    • https://buzyhub.com/files/mifurovoxezi.pdf
    • http://fulns.com/uploadfile/fckedit/file/1631062332bkSm.pdf
    • http://zehanbiopharma.com/upload/files/kejigixiwes.pdf
    • https://www.channeloflove.com/ckfinder/userfiles/files/buxokefununakitirun.pdf
    • http://www.huescalamagiaenfotos.com/userfiles/files/17162508532.pdf
    • http://tokstar.com/_UploadFile/Images/file/dupolapaponefiwigu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=nucleophilic+addition+in+carbonyl+compounds
    • 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_off0000b3ae.bin
2cc147dcbf1b54d60a9e9f24f8d47b4d02d18d365bea32fc36960a5f7f5c6207		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AE 16332 bytes
font_01_sfnt_off0000dd74.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD74 16792 bytes
font_02_sfnt_off0000f58b.bin
1993f7512d959c8c3f78f618f728a821596aad7600b0311e768068eae275d987		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF58B 11112 bytes

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