Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f6856816bffd9f9…

MALICIOUS

PDF

83.9 KB Created: 2021-09-20 04:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8573abd0422aa891f4f8bc4c85961b80 SHA-1: 9722fb8abced7f5d09aea5d56bac60b0255abe38 SHA-256: 3f6856816bffd9f9e2ff5b2e1ef71e0f0d80105713f38ddeee0ffa38d4b1bfc6
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_BROWSER_INSTALL_LURE' strongly suggests a social engineering attack aiming to trick the user into installing malicious software by posing as a necessary browser update or extension. The presence of numerous unknown URLs, many of which are PDFs, further supports this, as they likely serve as lures or secondary payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380b364545f---9386547225.pdf
    • http://nanumed.ro/uploads/files/ravedaxugejubixabisa.pdf
    • https://aristi-trap.com/upload/users/files/gekigogamovewumumupatuvuv.pdf
    • http://zimmerei-possert.at/lekolux.pdf
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/xiweb.pdf
    • http://shanghaiqingchen.com/upload/files/tiwubaniwedukufasu.pdf
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/guluzarapewa.pdf
    • http://perchegouet.com/ckfinder/userfiles/files/gubogikediv.pdf
    • https://thehouseproduction.net/file/vegerozi.pdf
    • http://tsg-edinstvo.ru/userfiles/file/zukemaxowato.pdf
    • http://chaodontuonglai.vn/uploads/ck_upload/files/17247776087.pdf
    • http://kingtonkatsu.com/uploads/files/luluvilawamun.pdf
    • https://dla-pracownika.pl/pliki_user/File/xivokamoje.pdf
    • http://perchegouet.com/ckfinder/userfiles/files/vagagajigixizufedovag.pdf
    • https://techielingo.com/fck_uploads/files/26371387725.pdf
    • http://recko.ru/ckfinder/userfiles/files/netefisagasa.pdf
    • http://cpk.by/ckfinder/userfiles/files/36730377980.pdf
    • https://fluffy-chins.com/images/file/votikalele.pdf
    • http://61kidsclub.com/userfiles/file/93703337331.pdf
    • http://hongdacable.com/d/files/32241203506.pdf
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/52697333529.pdf
    • http://93564497.com/userfiles/53817402768.pdf
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/nogesewamabarazo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=best+firefox+browser+for+android
    • 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_off0000e1c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C6 16792 bytes
font_01_sfnt_off0000f9dd.bin
2a0e537816894b587edf9ed9656b2a4bfe865c7b03fa0ef8e2593a455ca1087a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DD 10684 bytes
font_02_sfnt_off0001129d.bin
bdd8d1626e05ae2d92560ba45ff719421269b49a158f61679f48641b2a3160cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1129D 18040 bytes

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