Malicious PDF — malware analysis report

Static analysis result for SHA-256 8059c4ff045921f9…

MALICIOUS

PDF

73.9 KB Created: 2021-09-09 17:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb6b3693c8f6dd11ce43d5ea0fad9cde SHA-1: 71e5ab9dad78e6c55fe6512445e9f684bb500e4f SHA-256: 8059c4ff045921f980dacf60282a4b10ecb4703bf518fc88fbae2d7c440746b4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript is likely used to redirect the user to malicious sites or download further payloads, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://basyapiemlak.com/yukleme_klasoru/userfiles/file/tunipovebel.pdf
    • http://njchemland.com/upload/files/53754594553.pdf
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/67943914554.pdf
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/loleled.pdf
    • http://goldenteriyaki.com/uploads/files/3663564494.pdf
    • https://amatnieks.lv/pictures/image/10125946070.pdf
    • http://cmtoolsrental.com/user_img/files/88086687318.pdf
    • http://arsvet.ru/img/upload/14851442389.pdf
    • http://agedwedfjtj.pretty-match.com/upload/files/58774435161.pdf
    • http://zechnerbau.at/images/content/files/kawav.pdf
    • https://mmoxx.mn/userfiles/files/10079887146.pdf
    • http://3sdent.com/upload/files/11043443823.pdf
    • http://blow-w124.com/js/upload/files/25036460154.pdf
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/50021339615.pdf
    • http://dush-kz.ru/uploads/fck/file/79273038212.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/fui3pcmqsb5n8sqctgkd8fa8u5/wekokitafepefebuzivagexa.pdf
    • http://archinfo.ru/uploads/file/18582429017.pdf
    • http://naplesredeals.com/userfiles/files/megipupigowugivenigapage.pdf
    • http://morard-mcf.fr/data/Files/wenafajepixux.pdf
    • http://northcity.rs/slike/files/buzaserogojilidi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=mobile+push+notifications+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_off0000bb47.bin
fbd712fb81d988e9dcc363ab841eb5fbb7eadc4b35432375bcaec952af6284a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB47 17580 bytes
font_01_sfnt_off0000e93f.bin
7587c2ea60b8286f55bc82db4eb66d661d616c8eb8d20e42a6ef8468b07dab35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE93F 10948 bytes
font_02_sfnt_off00010259.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10259 16792 bytes

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