Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b840755ea29584f…

MALICIOUS

PDF

82.5 KB Created: 2021-09-19 08:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef35b2987f9010f935fe6982552770cc SHA-1: 7760aa8c46e8172070b01b8e80aa7fc837ec0e61 SHA-256: 6b840755ea29584f0529b6264e79d756c5974722409f28426c9ca82aaf038cfd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF sample was flagged by ML classifiers and ClamAV as malicious, specifically indicating phishing. The presence of numerous external URIs, many pointing to disposable hosting and forming a link farm, strongly suggests a phishing or malware distribution attempt. The document body is heavily obfuscated and contains no readable text, preventing further analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://net-marketing.hu/images/files/81989197484.pdf
    • http://transcash.com/ci/userfiles/files/julojiporimus.pdf
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/soliridetirire.pdf
    • http://blccy.com/userfiles/files/59444794606.pdf
    • https://biroestarsa.hu/uploads/file/74647003856.pdf
    • http://neoneophytou.com/ckfinder/userfiles/files/nejifuxakawaxib.pdf
    • http://csc0516.com/userfiles/file/20210904003319_s06zf3.pdf
    • http://supair-lux.hu/ckfinder/userfiles/files/60822838967.pdf
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/2476442984.pdf
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/dabinusimosubawa.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/ftf5ga7hv90hllhha9ddimdb2u/25302288208.pdf
    • https://cbdc.co/uploads/ckfinder/userfiles/files/kidafurajutopixuzogega.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134682e2f998---71919811870.pdf
    • http://kraemer-duennebacke.de/files/file/81976253104.pdf
    • http://thuocnam.xyz/images/files/24845012090.pdf
    • http://etoprosto.ru/ckfinder/userfiles/files/37432360993.pdf
    • https://luminex.pl/upload/file/zodekutimir.pdf
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/bovamavitebosasoditi.pdf
    • https://fonixkoncert.hu/upload/file/fitaro.pdf
    • http://taiwan-casters.com/userfiles/file/rejibozekite.pdf
    • http://kondicionery-noginsk.ru/upload_picture/file/8875325010.pdf
    • http://tbff-bygg.se/img/files/gijerolilufobasuxo.pdf
    • http://blueyee.com/upload/file/021910128181.pdf
    • http://www.bongbansaigon.com/uploads/files/62545439640.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=cute+words+beginning+with+m
    • 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_off0000dd37.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD37 16792 bytes
font_01_sfnt_off0000f549.bin
d83cfd13ef673081abd57e5363165c3819552895d93c215faaef227927ec05e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF549 18068 bytes
font_02_sfnt_off0001235b.bin
5cc3dfe50d178d40c3895027787c8080f354559584d043a86334914a787216a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1235B 10844 bytes

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