Malicious PDF — malware analysis report

Static analysis result for SHA-256 25954cde1fd4f443…

MALICIOUS

PDF

71.2 KB Created: 2021-09-25 16:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5fea53b92dfbcbad7c27615af8a24d8e SHA-1: 9bfb38aabc5190f7f706f3f630caf65e3a3946ec SHA-256: 25954cde1fd4f443975669020d6346824bc1ddd858e8b3cc712104ff74e5a7c7
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by an ML classifier with high confidence. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 4

  • 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://huntic.ru/uplcv?utm_term=gotoassist+android+screen+sharing PDF link annotation
    • http://hndgyl.com/v15/Upload/file/20219111851447042.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/28426715748.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/nunebujanawimitatad.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/97691293274.pdfIn PDF document text
    • http://ausietech.com/images/file/56907241228.pdfIn PDF document text
    • http://exim5.hu/_user/file/lavasatoludafe.pdfIn PDF document text
    • http://klientskazona.radeton.sk/ckfinder/userfiles/files/rudeguzewebego.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/46802785161.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/begakixegeko.pdfIn PDF document text
    • http://bubb.cn/up_file/file/mowaverufe.pdfIn PDF document text
    • http://abwrva.com/uploads/files/86106778277.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/13437070636.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/forujujakodoxafofibi.pdfIn PDF document text
    • http://imoroz.by/upload/file/bevaxetarilin.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/gavosifudugule.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/rogekakunatafewaweb.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614272b52827e---33106354308.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16149e4525aac2---tepexononunudatiwofapobu.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/bijoxitamasudutegurapurix.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/68048212258.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16130e56663bb4---tufuwe.pdfIn PDF document text
    • http://dinhviht.com/images/newtech/files/zomipizakexizoxuwe.pdfIn PDF document text
    • http://wamer.org/userfiles/file/5218408421.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DE 10640 bytes
SHA-256: aed317e42ecbab319bb3109d02167629722ae6eeb2da03553619d9271859ed13
font_01_sfnt_off0000c900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC900 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE112 17508 bytes
SHA-256: 0d1b7026de24f7597ca75ae65ffabe8fb26c4c8eb90a7d07e444344cb1d60258

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