Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e171b82ba7c5065…

MALICIOUS

PDF

70.2 KB Created: 2021-09-29 09:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dff788d24a9a1968ba2ae40ab0c5e08f SHA-1: fba6a9a4a54b5d73b4346e786ecf7e20af18d85b SHA-256: 1e171b82ba7c506527e511a9105f08f3dec48cffdd6809199fbc6ca2be71de02
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains embedded JavaScript, flagged by heuristics as malicious. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely provides instructions to decrypt a password-protected archive, a common tactic to bypass gateway scanning. The ML classifier also strongly indicated maliciousness. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://khangvietdn.com/uploads/file/dubobopo.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16152f8de82904---ginesizofupo.pdf
    • http://chanhungcorp.com/images/uploads/files/43140450643.pdf
    • http://zoltysnieg.pl/pliki_wyswig/files/zamazerabidorupuvupeju.pdf
    • http://zeminyerkaplama.com/upload/ckfinder/files/76345492360.pdf
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/24657331165.pdf
    • http://zamgph.com/uploads/file/050728162894.pdf
    • https://tradingphrases.com/userfiles/files/sakituruvobefobaju.pdf
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/bekev.pdf
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202195651423910.pdf
    • http://carrozzeriardue.it/userfiles/files/1825737365.pdf
    • http://streetnn.ru/data/upload/ck/files/zezajusegup.pdf
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/18230387989.pdf
    • http://1day2night.com/UserFiles/file/bafepeduxabaridib.pdf
    • http://digilit.ir/basefile/digilitir/files/50104124512.pdf
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/sexadukixozemi.pdf
    • http://bensonlandscape.com/editorData/file/42441657554.pdf
    • https://bongkartuantakur.com/contents/files/babeg.pdf
    • http://profiklub.sanswiss.cz/files/file/voxapuzodefo.pdf
    • http://sdes.in/uploads/46945243271.pdf
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/balifirededijis.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614efa1b6b08e---vowusobuzigutewokep.pdf
    • http://haai.org/upload/file/sixowodararino.pdf
    • http://viettelhaiphong.me/data/dulieu/files/kogizuzi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=atualizar+android+6+0
    • 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_off0000b01c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB01C 16792 bytes
font_01_sfnt_off0000c833.bin
d178eb023de661b46648ff7d9c68ea01e23163bd7036488a1e91977ff3f49eaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC833 10372 bytes
font_02_sfnt_off0000dfb9.bin
f0c8d8e04be0241c1a3bcb79b397e7f57a20ece176562706e2c098fed400b43d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB9 16500 bytes

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