Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b614b67f226d96…

MALICIOUS

PDF

87.3 KB Created: 2021-09-28 13:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b8a11bac7cf61a6e72654392aa09cb0e SHA-1: 19bbe75f181653c769fc0a0e2ec478f9412fbd86 SHA-256: 70b614b67f226d96e99f4fc54ed4486b32e68fd15121176de6c455e4fd32718c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous embedded URLs pointing to external domains, many of which are hosted on disposable or low-reputation domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to distribute content or phish users across many sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://irlanc.ru/uplcv?utm_term=zimbra+email+app+for+android PDF link annotation
    • http://dichvuhieuchuan.com/upload/files/90468883098.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f05b1fd83---13359919485.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/61592685a0f7b90a45d1b691bb9591d7/lugotijekamakasesewi.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/68274470334.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/jutezosurag.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/67122496448.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/jarig.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/92966349638.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/radivafunabotosipin.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/fokidu.pdfIn PDF document text
    • http://aven.su/userfiles/file/40234474780.pdfIn PDF document text
    • http://bwc.lt/i/mesukavamuborofixugoxeg.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/80850246199.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/35363695077.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/58597163181.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/jipogurewaxagobolika.pdfIn PDF document text
    • http://balalajka.nu/media/pepipelugolibajik.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/67123080493.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/bodoj.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/keredomezavekigiv.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/guwobolabufetuton.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/52282089678.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/lefamidivikag.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD373 10496 bytes
SHA-256: dc1fa7fe5f5b8251e626de171a5720146f9e84148396111988c367de7620fcc5
font_01_sfnt_off0000eaf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF5 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_02_sfnt_off000101ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CA 19764 bytes
SHA-256: a09e273cc79bb18f19f83c67dbaf1e89f2aed4b86de20f233f11af9b05160eb0
font_03_sfnt_off0001354a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1354A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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