Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3bad981797a0b6f…

MALICIOUS

PDF

71.8 KB Created: 2021-09-28 20:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b13de480db4c3f00138607d36c5b20ce SHA-1: 265d3fe90742793679678d8ab23a904524f09cb5 SHA-256: e3bad981797a0b6f2775ca2b4736a7cba578a3e9ea94bc36877213dd34411084
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm with numerous distinct hosts, suggesting an attempt to direct users to various potentially malicious websites. The presence of multiple unknown URLs reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://magerp.org/upload/files/19013153144.pdf In PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/80483800833.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/vituvutejasotolosevawonab.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/75297216660.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/fogatebotajowawe.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161350e5f644ab---wipilezepusogogi.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/tapemoz.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/92867751362.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/feripariguvetodegezev.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/95116797935.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/ximutevinokelo.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/vefodotanini.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/medibekizuxalemukesose.pdfIn PDF document text
    • http://devveb.net/userfiles/file/tuvinimevig.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/79874307880.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/25359764052.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/disipokoxezosirukazapazix.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/25428731539.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/bifiviputaxal.pdfIn PDF document text
    • http://theponghop.com/upload/files/4373821395.pdfIn PDF document text
    • http://specialcats.nl/media/files/34134209469.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/rasukefadupaxuzizuvidok.pdfIn PDF document text
    • http://levotst.com/uploads/files/88857611515.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/48473298028.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/pexasuboloxidoporegubura.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614fcf166bb8a---72809357478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=gangster+4+hackPDF 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_off0000b62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB62A 17160 bytes
SHA-256: 170c2e3b785e1d7b1034a6b2f8c685a633cab8d5cf4f99d8fd027ec24fdd64b8
font_01_sfnt_off0000e1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BA 10460 bytes
SHA-256: 1fd1ce72e8d13dc6e4c88d15e00bbab99f9d5441f82651d016453fe9f1eee2d9
font_02_sfnt_off0000f986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF986 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1