Malicious PDF — malware analysis report

Static analysis result for SHA-256 97a438a1f08ef993…

MALICIOUS

PDF

94.8 KB Created: 2021-09-18 03:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c56ea99047faa92cebf1351071102fb3 SHA-1: c8da220867b2372d1199ce70a0027325dd28977e SHA-256: 97a438a1f08ef99348129649b64869dc9f3d033af8dcde75e64880ba2b095d59
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains embedded JavaScript and numerous external URIs, suggesting an attempt to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that this PDF is part of a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://finchamauto.com/pics/tegalefe.pdf
    • http://sewakendragroup.com/userfiles/file/36038790377.pdf
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tiwaxakor.pdf
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/lidikodameluvuvakoli.pdf
    • http://a-pluset.com/userfiles/50639150664.pdf
    • http://uniondrygoods.com/fckeditor/userfiles/file/vuxokofekilirulozamuletol.pdf
    • https://ags-car.com/upload/files/fafunivotikuw.pdf
    • http://theponghop.com/upload/files/4868462049.pdf
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/leparusufojufa.pdf
    • http://fkm-lux.by/var/upload/file/luwovodotik.pdf
    • http://synphabase.ch/upload/file/wixuzawokoreluliri.pdf
    • http://jiji.pgo.tw/pic/uploads/files/17764169516.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df23748b65---10888089926.pdf
    • http://thienlongadv.com/upload/files/zavenopunizimulaweso.pdf
    • http://desushibar.com/userfiles/file/10747152391.pdf
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/gorojeb.pdf
    • http://cableesmaltado.com/d/files/viwiwozebojusimamawo.pdf
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/fubewenisigut.pdf
    • http://3q1p.com/upload/file/210914043140570376j6p2k1rxmw6t.pdf
    • https://illustrations.noche.fr/images/files/judonesojaruvin.pdf
    • https://lentes123.com/aym_image/files/99706078092.pdf
    • http://kbautotech.com/board/datafiles/imagefile/foxugol.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=twd+s6+e16
    • 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_off00010ce4.bin
bff46df9f52ef10457b5d53da4408e9b4310a9a90f397130def21c42802ca777		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE4 9788 bytes
font_01_sfnt_off0001228d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1228D 16792 bytes
font_02_sfnt_off00013a9f.bin
1f57763f9809b13fafb0f19ec4b8685b948207501e09e38e8a0705dab9e468fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9F 18892 bytes

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