Malicious PDF — malware analysis report

Static analysis result for SHA-256 389a185ec374c9b7…

MALICIOUS

PDF

75.9 KB Created: 2021-09-21 12:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b216e53a8e6967f8ef80917c12d8f1c6 SHA-1: 8e7e7f6c276df008ed1c4de62207a3b971230a5e SHA-256: 389a185ec374c9b7a32007cdd6dac1ca9cbd04a9243894d22dcad4ecb09eeeb8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic analysis identified it as a link farm with numerous disposable URLs, suggesting a phishing or malware distribution scheme. Although no scripts were directly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://avvocatoandreabruschi.it/userfiles/files/junabumesabelipemap.pdf
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/66261990069.pdf
    • https://www.gico.ge/ckfinder/userfiles/files/tirexisutafewiwutarez.pdf
    • http://cmtdental.com/upload/ckimg/files/68419333144.pdf
    • http://urbanelect.com/userfiles/file/22066361792.pdf
    • http://bhavalaya.org/ckfinder/userfiles/files/nafunejodolagorome.pdf
    • https://soudureornementalelauziere.com/upload/editor/file/64621180526.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161461a7de5208---tosuleribibegugu.pdf
    • https://tskrea.com/userfiles/file/68524653669.pdf
    • https://uzmanwebci.com/calisma2/files/uploads/satatisegamitejokaxapegef.pdf
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/negagotazaxojuzini.pdf
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17282325106.pdf
    • http://citranco.com/users/files/tosuximev.pdf
    • https://dalnoboy.com/data/filestorage/upload/files/68742085392.pdf
    • http://zhfangyuan.com/uploadfiles/files/peresokupemunow.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/1d821602f54d29e3d8c257f2947b71ad/womaduzerejobufapiwekezew.pdf
    • http://alltechsro.cz/files/36801899130.pdf
    • https://ulsantour.com/FileData/ckfinder/files/20210920_DD31E6E97CB0CE1C.pdf
    • http://togul.org/sites/default/files/file/jojulaxuno.pdf
    • http://sarkar.ie/userfiles/file/bivagunigumub.pdf
    • https://zlato-invest.cz/upload/files/xineravu.pdf
    • http://sin-hua.org/userfiles/53411061951.pdf
    • https://segurodegranizo.ar/noticias/fckeditor/file/77237135034.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=download+file+free+fire+ppsspp
    • 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_off0000c112.bin
456bfa2d385bbb872ab94074cf5623f265b32f2c10e8d7a989aab2c2b6ef7fbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC112 18684 bytes
font_01_sfnt_off0000f224.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF224 16792 bytes
font_02_sfnt_off00010a3b.bin
1d07212a2bf41012f441f3cf8d5382c907a13c4884d84d557520e7a131315a59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3B 10480 bytes

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