Malicious PDF — malware analysis report

Static analysis result for SHA-256 83200f37cb06cd85…

MALICIOUS

PDF

80.0 KB Created: 2021-09-15 21:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a2a6178e4905bb7e12bc4b371bf6763 SHA-1: 3fcd82aa63870ad4b86fba58c7ceea579568f8bb SHA-256: 83200f37cb06cd85381d4f99111e6ee2230a33e64fe291d0dd32228312586866
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://archism.ru/uplcv?utm_term=aot+mobile+android
    • http://magicfood-cn.com/files/20210914094418.pdf
    • http://rancholasmonturaspremios.com/campannas/file/70254106147.pdf
    • https://natanashoes.com/kingkong/userfiles/files/98025478431.pdf
    • http://huntland.hu/upload/file/dobajubisizil.pdf
    • http://pijntherapie.be/uploads/files/nudomulewebisesemosu.pdf
    • http://appartenvue.net/appart/upload/images/80427675339.pdf
    • http://royalgoodviewresort.com/Uploads/file/fenilosariwijumi.pdf
    • http://leoclubmarsala.it/userfiles/files/68819294085.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161301c7cb2de5---32368810245.pdf
    • http://brezov-gaj.si/uporabnik/file/25843206062.pdf
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/64877313522.pdf
    • http://mclarenquartz.in/ci/userfiles/files/fazamarep.pdf
    • https://nepalmicrofinancesummit.org/userfiles/files/73823261736.pdf
    • https://franchise-vietnam.com/app/webroot/img/files/pipaxanowoninidu.pdf
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/gikidi.pdf
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/92347862362.pdf
    • http://emilygrilltogo.com/uploads/files/nazukudas.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae5fdf3c7a---9673481481.pdf
    • http://jiangsutravel.kr/userfiles/files/20210902_135148.pdf
    • http://goldenstarhotel.vn/images/uploads/files/12889331560.pdf
    • http://haiannweb.com/uploads/files/jamefulilipa.pdf
    • http://asliev.coco1490.com/upload/file_folder/file/tesevorulazokelizezafovat.pdf
    • http://honmamon-s.com/img_seminar/userfiles/file/30375876261.pdf
    • http://protectakoteasia.com/ckfinder/userfiles/files/lugafadojopabovewafigakur.pdf
    • http://maroba-zirndorf.de/file/13546494168.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_off0000d2a9.bin
564f407dab860077359e49c91854baea270580163820650c3424d2383939d6f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A9 10364 bytes
font_01_sfnt_off0000e9f7.bin
1bf6ed27f6d902ce14b4d13f9f9c4c87e75e0a9f7ff7e21160dbecfe8c995d27		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F7 18336 bytes
font_02_sfnt_off00011a42.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A42 16792 bytes

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