Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8fc9ae72461b9c7…

MALICIOUS

PDF

83.8 KB Created: 2021-09-20 03:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 409198bc5b9606acd9afa526465f12e4 SHA-1: 7758bbb46b2f69341b040fdab01d48e03c79cd9d SHA-256: e8fc9ae72461b9c72a483fb2815f05257ed7c388c80dfe64d0ff3186cda3b43d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm pattern, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pistant.ru/uplcv?utm_term=downfall+full+movie+with+english+subtitles+free+download PDF link annotation
    • https://kermanrooz.com/img/files/sujumulaparuwaliliger.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/wetaduj.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/86158612114.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/79164814874.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/zozawifoneride.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/30773831256.pdfIn PDF document text
    • http://ruresept.ru/files/file/binagunigifos.pdfIn PDF document text
    • http://immopolignano.lu/images/sekilugopokuzevo.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/82139076911.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/55160974479.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/pejojev.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/banimonerupeluxa.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/35949503500.pdfIn PDF document text
    • https://songhongresort.com/img/files/31360700091.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ea0b8d43a---nuvenowevakowu.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/duxotak.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/fijogubeler.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/bosagux.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/vopasadixojotege.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210906110648.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210915_BD142EE84AB73CE8.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/10258477579.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/64101984557.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/4935768464.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_off0000e284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE284 17364 bytes
SHA-256: 9263f3eadadb3b300ec4206d67408eea37e086f3980f558afde115db441049c2
font_01_sfnt_off00010fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B9 11192 bytes
SHA-256: 1a7a9dc59e407bc50ae1c5b4320cab047cd33999eeae64f1d342c4e1784c7304