Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37a182122eff81a…

MALICIOUS

PDF

74.9 KB Created: 2021-09-26 02:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a1d0460c53df30117bcceafb426b1f82 SHA-1: 779cfdc56827be48e614ae19bdc5999599c6e794 SHA-256: b37a182122eff81a6299e77ad9a2f3735a941f80c97260fd9fb88242aaa33c56
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs that point to disposable hosting and function as a link farm, a common tactic for phishing or distributing further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggests a malicious intent to redirect users to potentially harmful sites.

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 https://medvor.ru/uplcv?utm_term=the+sopranos+project+free+tv PDF link annotation
    • http://starinviter.com/ckimagefiles/59517182569.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/bepevarexugezufen.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/46274910557.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/961294410.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/88424799736.pdfIn PDF document text
    • https://dienmayngalinh.com/img/files/79451459313.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/wibebefikakojekepe.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/38320618300.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/56901039843.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/pewatesorelepotapijatit.pdfIn PDF document text
    • http://newworldss.com/uploads/file/84206727792.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109061207313005.pdfIn PDF document text
    • http://platcometals.com/images/file/rexatezozuletutev.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/wujasizoduzugedefapa.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210917_C7B7A3123F19EF2F.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/gaganaduferagat.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/mikasigunuligabevebipe.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kefizidimitebu.pdfIn PDF document text
    • http://immopolignano.lu/images/61332490702.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/40647601486.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/razaxinivefodemazetuju.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210904075833.pdfIn PDF document text
    • https://papiratisk.cz/soubory/57118136774.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_off0000bd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD551 10600 bytes
SHA-256: 53b40ed683512de3381f6038b4914803f40b855cb8778e0fa739692e499bbd14
font_02_sfnt_off0000ed95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED95 18632 bytes
SHA-256: 95ae85a392d809b7c89e33377d0e1cb9b573d12441bb5b40dd8ff1852f112d09