Malicious PDF — malware analysis report

Static analysis result for SHA-256 4341cdd83053a90e…

MALICIOUS

PDF

80.6 KB Created: 2021-10-05 18:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b94c5019a4a2ac51956276e28868ecad SHA-1: bcfc5c44d24ddb505fa82d11e11279ec4633d0c4 SHA-256: 4341cdd83053a90e9796141746d9ca58c8dd676fc7a5992e5e6ea56d18888f2e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains embedded JavaScript and a large number of external URLs, many of which appear to be part of a link farm on disposable hosting. The embedded JavaScript likely serves to redirect the user or execute further malicious actions upon opening the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://cructi.ru/uplcv?utm_term=itil+transition+planning+and+support
    • http://rydelko.pl/userfiles/file/radozid.pdf
    • http://robwalker.net/fckupload/file/pimisewepivuvelo.pdf
    • http://master-sign.ru/ckfinder/userfiles/files/30543100460.pdf
    • https://gulamanis.com/contents/files/suvuxipixejukubibasurodit.pdf
    • https://ksuskalology.com/images/file/tugoveb.pdf
    • https://mytekas.com/UserFiles/file/42111048179.pdf
    • https://siriusdynamics.com/assets/uploads/files/sesajozes.pdf
    • http://sacmacbook.net/userfiles/file/ladavava.pdf
    • https://haruhonpo.com/upload/haruhonpo/files/26572163900.pdf
    • http://friend5190.xyz/js/ckfinder/userfiles/files/boxesutapa.pdf
    • http://scro.ru/pic/file/ziferokovibolir.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146fdb0a0a76---12618101071.pdf
    • http://xn--h1acbpobggs.xn--p1ai/data/files/senetujarakutamowimip.pdf
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/10163012266.pdf
    • http://phanphoiongnhuahoasen.vn/upload/files/sapere.pdf
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/vagavavomurimuvibetidomi.pdf
    • http://zzquansu.cn/d/files/14227734349.pdf
    • https://mldom.xyz/web/img/podborky/files/77126700951.pdf
    • http://ubytovani-budejovice.cz/picture/vtextu/file/zamenudupi.pdf
    • http://smsgurugram.com/miet/assets/files/gusedu.pdf
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/61520408361.pdf
    • https://hobbes-group.com/upload/files/rerebesoritewolal.pdf
    • https://mysmartedu.com/uploadimages/files/fawopobuxitixilev.pdf
    • http://alda.pl/ckfinder/userfiles/files/6849991841.pdf
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/jawibakofesadibulefimazu.pdf
    • https://krossi.ru/images/content/files/68811426090.pdf
    • http://smartickgroup.com/userfiles/xuxokubujeporebobozomitu.pdf
    • 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_off0000d9d6.bin
b0e955f2f3d336fe88170c5a82de4283f9883bf2cc2d056bdacbff33fe97eb39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D6 16704 bytes
font_01_sfnt_off000104d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104D4 16792 bytes
font_02_sfnt_off00011ceb.bin
9c5daca6a9f92fbfa329460310b24cfbcc24981b84c9f99b31ebf41b6a3ad7d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEB 10484 bytes

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