Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f315cd2d263fd79…

MALICIOUS

PDF

69.6 KB Created: 2021-09-21 04:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 113362ce478924fb685b086c2d683b7d SHA-1: 69dcad7b2a5a8846247e2812e12a305f6da3302e SHA-256: 8f315cd2d263fd79cd365ea3f43acafa865a7fb170e15c5734ba11efe24475ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a pattern of using disposable hosting for these links, further supporting a malicious intent to distribute or phish.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nomylo.ru/uplcv?utm_term=knocked+up+putlocker PDF link annotation
    • http://ymmicro.com/files/files/7653986153.pdfIn PDF document text
    • http://osayit.com/images/file/53162778675.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/92559672140.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/9009809924.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/46631702179.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/falat.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/41522747601.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/zofopubepoxozamemojiben.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/mekam.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/davudodedowawadovivutiri.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375f117ca7e---10344622832.pdfIn PDF document text
    • http://synfarm.com/upload/files/pirut.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/22105123563.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/tarobadaxobalunatuf.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/kurugipewifi.pdfIn PDF document text
    • http://ubest.ru/images/file/bupokefifunomevexiwu.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/98757902116.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/je5t4nquotch485f9gknodo5v6/66442713891.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_off0000afe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F7 10268 bytes
SHA-256: c6bab3edf1a18065bcfa19bd0309baa92f187c842d233f75f35f38b639d632f4
font_02_sfnt_off0000df27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF27 16564 bytes
SHA-256: 5859e36faae80833b38f65735fbae51e859ca483334f5dd51ea534b511f0c4f2

Open this report in the interactive analyzer, or submit your own file for analysis.