Malicious PDF — malware analysis report

Static analysis result for SHA-256 134b91a8c1dd8795…

MALICIOUS

PDF

84.3 KB Created: 2021-09-09 20:37:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4c300f551f51223665dff10d9eb1f2a3 SHA-1: 3034126259c97e6c0003fbb7dcf9d7bae1dc06b9 SHA-256: 134b91a8c1dd87957b7e1a16080ed3cf63c64e8e5ac8d24625b57e8204f402c1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of external URIs and the link farm heuristic point towards the document's purpose of directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=roblox+hacks+scripts+2020 PDF link annotation
    • https://carcable-bg.com/uploads/pictures/files/65811799920.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/risapifuvarusoba.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109092136033237.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109090157057645.pdfIn PDF document text
    • http://imbirimbir.ru/files/6147997868.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sadaror.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/votogufav.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/58815203721.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-4/20210904105222320919.pdfIn PDF document text
    • https://kultmotor.hu/images/files/44202857877.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/zeboguwuzugelod.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/nujivovamufug.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/lekegolufuwosa.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/88696280995.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/24254528214.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/62191119001.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46299839645.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/teravenobanenat.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/7435880686.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/52582804857.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613496e1d9d10---matifawo.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/kesifudusesivog.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/winazisafavotuxopufozupos.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c824cff65---fotevogano.pdfIn PDF document text
    • http://blccy.com/userfiles/files/garosawelives.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_off0000e2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B8 10856 bytes
SHA-256: b204613ab2c097139343232088fb34d467512d4aa767aab9bfb4b1de92ce8e2f
font_01_sfnt_off0000fbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCB 18236 bytes
SHA-256: 4c26794d76bca4094385da94259049a75e3f5cb9c60e01c52f5cdecd0793d3de
font_02_sfnt_off00012b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1