Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a4196070a2e17d…

MALICIOUS

PDF

75.6 KB Created: 2021-09-13 15:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf606880bcf01ed2cc546015b1ebef7d SHA-1: f902cdb3b4903d0d1020cf09428619a7bc21c9ac SHA-256: 57a4196070a2e17d2917910a1a80cc637f223cb7cd6a3a10259551b1017ff1c5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm structure, suggesting the primary purpose is to redirect users to other sites. The embedded JavaScript likely facilitates these redirects or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31724247495.pdf
    • http://tincorner.vn/uploads/files/papegunejikowinosirafiriv.pdf
    • http://gmart-express.com/demo/uploadpic/file/rebinelixexe.pdf
    • http://nkmate.com/FileData/ckfinder/files/20210913_6B91527E93EE66C3.pdf
    • http://rydelko.pl/userfiles/file/beliwariw.pdf
    • http://cambridgekapurthala.com/damana/userfiles/file/69991003180.pdf
    • http://bilcafe.it/userfiles/file/zozedu.pdf
    • https://dgssu.com/upfolder/e/files/20210909060258.pdf
    • https://motiwalainstitutes.org/userfiles/file/15933091454.pdf
    • http://grandrosso.com/js/upload/files/pakusuwuroxalatevoretat.pdf
    • http://hoigolfbinhthuan.com/users/files/pukoxasezivizo.pdf
    • http://oresteruggiero.com/userfiles/files/denenolidizapofisuba.pdf
    • https://rewaqousha.net/userfiles/files/587858556.pdf
    • https://jagamimpi.com/contents/files/96776480534.pdf
    • http://fotostudiovaccari.it/userfiles/files/kixotifevejafu.pdf
    • https://snf.styleguides.ch/userfiles/files/26260461710.pdf
    • http://bright-mineral.com/uploadfile/file/2021091105004890.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/2fdfe003eaba6352923f391711e1292c/15910272164.pdf
    • http://vip-cond.ru/userfiles/file/10466228692.pdf
    • http://motocams.cz/ckfinder/userfiles/files/41123428844.pdf
    • http://glavis.biz/userfiles/file/pamofavunokutezexe.pdf
    • https://smilaxlabs.com/userfiles/files/lajazi.pdf
    • https://sibservis.com/ckfinder/userfiles/files/48337147726.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=picsart+gold+free+download+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_off0000c641.bin
61b3714971ae911a7a0e4d55b72fc10e667ffa31b5db0621f878f0a2f20787d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC641 16084 bytes
font_01_sfnt_off0000ef53.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF53 16792 bytes
font_02_sfnt_off0001076a.bin
a264f4ea37dae56f16fceb0e417034d76e08b536060f6fd5b88123900249e8a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1076A 10972 bytes

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