Malicious PDF — malware analysis report

Static analysis result for SHA-256 5155b526f9000843…

MALICIOUS

PDF

68.8 KB Created: 2021-09-19 23:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4905d5a9a1420b6128c42a0d5dded291 SHA-1: 7637e5c9743da95df86c4455778aacce127999d8 SHA-256: 5155b526f90008435b09c5d5ad653ae07a68c029a273298a4093f84c5de69783
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many of which point to suspicious domains and are likely part of a link farm designed to obscure the true malicious intent. The ML classifier and ClamAV detection strongly indicate malicious content, likely phishing or malware distribution, disguised as a lure for downloading GTA 5.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://srldirect.com/ckfinder/userfiles/files/sirefobule.pdf In PDF document text
    • http://masterref.ru/editorfiles/file/33112904038.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/gimavex.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/reseg.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/59783755818.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/donakiduzupipaxefer.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/97094632621.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/fumagusefetuba.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161321f08f36d3---zasojosobugi.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/88831306994.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/newukopafirawatebagutaxuk.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/45842472362.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/62627895217.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130695878412---fowumexabidakilizevo.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/fokegobom.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/bakinor.pdfIn PDF document text
    • http://gibisch.biz/files/files/80417512897.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/wedakasapegogovonanuf.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/58533693590.pdfIn PDF document text
    • https://rajaunited.com/contents/files/49358851451.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/87840567626.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/timebelolawiwaw.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/33683239005.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+download+gta+5+android+freePDF 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_off0000b203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB203 14148 bytes
SHA-256: 4f5b043535302519cde000c1f88489654390ac7970fd57b4783c705bc847d588
font_01_sfnt_off0000d545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD545 10572 bytes
SHA-256: 284cbdf281cf4f336548504146afa60a08ea9956b49f8d8c9e538e365669aefa
font_02_sfnt_off0000ed5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1