Malicious PDF — malware analysis report

Static analysis result for SHA-256 7482b3bb3f8b6152…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 09:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f98c878c931240c000862897f38866c9 SHA-1: 16e59bf50916889be43c717b3fb8b5dd5a904186 SHA-256: 7482b3bb3f8b6152f0dbd3d0d27626612849c259f252e72ec0816aeaefe37f0b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the link farm characteristic suggest an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://linhkienhunganh.vn/luutru/files/kibosudoviboze.pdf
    • https://biocoils.com/img/file/95430303846.pdf
    • http://everest-c.ru/ckfinder/userfiles/files/72298935421.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/a2ksvt3t1mtuuk0bc183fqdhg7/fipuzozodogip.pdf
    • http://darec.sk/files/files/86683376878.pdf
    • https://fong-cai.com/upload/files/47861955787.pdf
    • https://b2b-intelligence.it/uploads/file/lagaleperurulizijakirik.pdf
    • https://bachson.net/upload/file/bofoxokofopidodoranopajik.pdf
    • http://rungruangsteel.com/public/upload/userfiles/files/91337525200.pdf
    • http://canoeing.by/pics/files/dogopoteno.pdf
    • https://pixel.bg/img/file/jamupikasixer.pdf
    • http://cerrutistudio.eu/userfiles/files/16594730351.pdf
    • https://ohcsi.com/ckfinder/userfiles/files/39812652897.pdf
    • https://nieruchomosciprzetargi.pl/files/file/91444967571.pdf
    • http://huefpdf.org/upload/file/joguvorujoxibegobeti.pdf
    • http://katour.ru/admin/ckfinder/userfiles/files/84997480377.pdf
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/64978246527.pdf
    • https://trongtrucsolution.com/uploads/files/vubesafuwulabiwilasoxe.pdf
    • http://telek-trans.hu/editor_up/nosevefomobipenuxuviga.pdf
    • http://erulingua.hu/uploads/content_files/files/7987054586.pdf
    • https://www.paseppe.gr/ckfinder/userfiles/files/lifevogexugigimabumuru.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c19ed620ca---dexugizotuwodowigatubudox.pdf
    • http://toyotarent.tw/FileData/ckfinder/files/20210904_04F18C6A27180538.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=dalton+billiard+ball+model
    • 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_off0000dc85.bin
f6fa76eefa8d8be919a3534487c7e90715056ef466055dcc9690062d9a665d8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC85 18352 bytes
font_01_sfnt_off00010c5b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5B 16792 bytes
font_02_sfnt_off00012472.bin
d4dfea5a76ba70a745a5ea3e456ccc0dddab7255c7a30678815702a2a74aa6fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12472 10384 bytes

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