Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e0bf8c282cf4fa3…

MALICIOUS

PDF

69.9 KB Created: 2021-09-30 21:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 152c42208096303b6402f31d065947fa SHA-1: f359f3f0afbb9fc4b4f8751eff1254c16c0ca926 SHA-256: 8e0bf8c282cf4fa332f73551e60654522d176a49f24bc43c23370fd736b78013
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The presence of external URIs and the link farm heuristic suggest the PDF's primary function is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://garglob.ru/uplcv?utm_term=best+video+calling+app+for+android PDF link annotation
    • https://regenerateacademy.com/file/9568430322.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/nusebudaxejo.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/vinawejitomoloma.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/koxisesow.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/xewexuforixu.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/zirikewufekazuwidunumalu.pdfIn PDF document text
    • http://hflchw.com/upload/file/60436924332.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/3365000693.pdfIn PDF document text
    • http://wamer.org/userfiles/file/lerokodanoloseribobu.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/669907084.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614c94e73b228---gagirironuludes.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/18925040968.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/68478489048.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/5391140924.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/jewifejuw.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/mapujalirimemiwijugavu.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/23915907625.pdfIn PDF document text
    • https://quizai.com/uploads/files/gejepijulureli.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/19334366650.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/99696853334.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/zijufejujewabimirujuvo.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/keweluzuvijomokax.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/90582000316.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/99897456451.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/gimomuxe.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/vodazegijolef.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_off0000b1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C6 15584 bytes
SHA-256: 862daf36b0444abb972f95d9162c4caf791c447ba9beccbe687b12256eb8ade8
font_01_sfnt_off0000d8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D8 10916 bytes
SHA-256: a4936489791e4588be8412e29fe2f62208da5a0033488ae77604f71a1f82a69b
font_02_sfnt_off0000f211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF211 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1