Malicious PDF — malware analysis report

Static analysis result for SHA-256 f71ece29cc16ea28…

MALICIOUS

PDF

88.0 KB Created: 2021-09-21 23:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a365cc05ed80e9a3273c4f6aa6f8c3c9 SHA-1: e7c1e6552fee935f9898fcde65029c2a7d92f60b SHA-256: f71ece29cc16ea28955988c31d9e3e739c6a03490c749355cec337b63c014af1
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 malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous distinct hosts, with one URL specifically targeting 'streaming apps movies'. While no scripts were extracted, the presence of numerous external URIs and the overall detection profile strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://inwebjor.ru/uplcv?utm_term=streaming+apps+movies PDF link annotation
    • https://catbasailing.com/upload/fck/file/87670443509.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56514934951.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/bigupidelijasamukifaxojub.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/56122791856.pdfIn PDF document text
    • https://serka.com/serka/upload/files/litadazibuzasunoki.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/fb0afd6ba26af9047538ef66f9347b15/kovuvevalefurinetavituju.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/regilisiduraxa.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/85031940591.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/ritumumukovukopalumo.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/fizorul.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/28587378629.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/d0cbcfb9e1cf37544d786e06933b96d2/70089238963.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/26400680047.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/82538989480.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/lutezukuvufemepigu.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/10869190321.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/muvusegatogeluwuruvopasu.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/gexano.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/galapatafuwejamuzu.pdfIn PDF document text
    • https://sapsda.org/SapmaUserfiles/file/rodijuwukefi.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/tesonoxivawofiguloliwe.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/44035604301.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/fafefexilanagedegakusi.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_off0000f314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF314 10688 bytes
SHA-256: 035f0e15a26bec634c5f3496a616fed5f3c4e884fb120f5ca7fc0504131c85f9
font_01_sfnt_off00010b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AB 18048 bytes
SHA-256: e0ed3caf57f57392ad1b654d5c29096a16df7b6fc97efa53fdc8a598ff344e74