Malicious PDF — malware analysis report

Static analysis result for SHA-256 f57e41645811719a…

MALICIOUS

PDF

69.7 KB Created: 2021-09-29 00:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 705e3aa5ff43193d75b54532a15a1bc1 SHA-1: fdf1ecfff4de718856d711644223ab094e4117de SHA-256: f57e41645811719a1a5a263adb092a05916a94e137fd51e9177921b89e17ed53
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external URIs, including a link farm on disposable hosting, suggesting it's used for phishing or distributing further malware. The primary attack pattern involves luring the user to external sites via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pixomot.ru/uplcv?utm_term=naruto+senki+full+character+free+download
    • https://newshieldinsurance.com/demo/gsa/final/images/file/9578135853.pdf
    • http://kavernoklub.com/campannas/file/zaziramogazuzinowinago.pdf
    • http://akcjonariusz.com/UserFiles/file/82962253373.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/bsr6oji51rmchrlfpmtmamguo6/jobaxile.pdf
    • http://soosanfix.com/upload/fckeditor/file/fabisiwixadegalalipava.pdf
    • http://daegyung.kr/userfiles/file/20210923035158.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161440a6b1f258---sapapizulude.pdf
    • http://thuduchouse.vn/pics/file/mipoximurakomuf.pdf
    • http://khodahoanglang.com/admin/webroot/upload/image/files/27347473099.pdf
    • http://kingsfinancialconsulting.com/userfiles/file/zakodazonitiwi.pdf
    • https://tasivn.com/upload/ck/files/96577855332.pdf
    • https://tjpapigroup3.com/contents/files/fobijovi.pdf
    • https://needlugs.com/userfiles/files/40960618676.pdf
    • http://yanarfabrics.com/firma/files/xuzomijazaw.pdf
    • http://quimis.org/js/ckfinder/userfiles/files/musaxesovodavizo.pdf
    • https://ans5680.preneed91.com/upload/files/80557907156.pdf
    • http://fields-on-earth.com/images/blog/file/75090914700.pdf
    • https://wonwon.taipei/photo/file/96986259189.pdf
    • http://files.ibiza-ferien.de/file/lofedonupiwojuroxoz.pdf
    • http://millecolori.it/images/file/90344425173.pdf
    • http://okun.su/upload/file/gejisixunuma.pdf
    • http://hyeminshop.com/DATA/files/nofifuwuxibiv.pdf
    • https://fruitssupplier.com/app/webroot/img/files/63997725776.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_off0000af99.bin
0da5078b8f0a4d22234071aabe5357edc5b7aca8f0e2850b7caf21b442b05295		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF99 10828 bytes
font_01_sfnt_off0000c89a.bin
a590330e88dc0f219f2bfb0f76912b5d1aa6890853cb33af6fe1e9f96ee1ca10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC89A 16032 bytes
font_02_sfnt_off0000f15f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF15F 16792 bytes

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