Malicious PDF — malware analysis report

Static analysis result for SHA-256 abe8420a6bf3945d…

MALICIOUS

PDF

87.6 KB Created: 2021-09-23 15:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7da918357e25239484aae9a977a5a710 SHA-1: dc612f11c9b9f4dd4d32dc57740cba71f3720493 SHA-256: abe8420a6bf3945dfdd2f6d063e8bd9772912ff178d3ed7033fb7ae07e8d17cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the PDF and its embedded links point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://rosycaffe.com/file/vazipero.pdf In PDF document text
    • https://ost-fogging.com/upload/files/31256802253.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/pumiluguziravuwufemov.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/vobaxet.pdfIn PDF document text
    • http://vhshf.de/File/mokipu.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2f06dd5e75e7394733a50c87f43dc1e2/xobetadixerekanumib.pdfIn PDF document text
    • https://photojet.net/userfiles/file/leninasofol.pdfIn PDF document text
    • http://runo34.ru/attachments/file/45100005378.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/67844971903.pdfIn PDF document text
    • https://limadelimon.com/images/file/jaxonuvaxinobisurapes.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/rorawuwelar.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/fazuk.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/gatuguboromevefolebi.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/julifatusoxivefebewegis.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/25075501473.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/fulazovolijitiw.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/9714307587.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/dakifemase.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16144cffe6ce3f---jifefisamun.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/5082114154.pdfIn PDF document text
    • http://dnestrovsk.es-pmr.com/constructor/dnestrovsk/ckfinder/userfiles/files/zibonej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+stop+android+phone+from+talkingPDF link annotation
    • 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_off0000ee16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE16 11116 bytes
SHA-256: 1366d345faa7d4cb1ceff152fc047324063573f44bf36b22dfdcdfcf301141a4
font_01_sfnt_off0001079c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079C 18828 bytes
SHA-256: 46d0b5be131bd69e4acda20c66918728a54abe1be1839a35821a0aea278c67b9
font_02_sfnt_off000138ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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