Malicious PDF — malware analysis report

Static analysis result for SHA-256 185bc8384c47329a…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 00:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2875bab5c8831adee2496d32ad622025 SHA-1: 4ebd8e691cbca4c8fb2bc0f4586d430c71a3a4cb SHA-256: 185bc8384c47329a83bf674674eab91105deaeebd5786d96b6250d78748f6e36
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external domains, indicating it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the high number of distinct hosts suggest a malicious intent, likely to redirect users to phishing sites or download further malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9858

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://crewmak.ru/uplcv?utm_term=stream+bollywood+movies+online PDF link annotation
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/kunubiravonivexotowumisi.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/70028863061.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/8qp16uj07mnpbio6d95jor9adn/60173945309.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/selule.pdfIn PDF document text
    • http://rococosofa.com/files/files/47434237072.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/pukitexekuwubatov.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/83196160323.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/53198795412.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/tazojuwemebujinekiwoxujo.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/67470088927.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/65554581906.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210916_210122.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/81393551314.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/81460131957.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/45020574263.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/7562192195.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/semajodapevupixovim.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310024a52c9---76603326248.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/26335057773.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/fojugeku.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/83704457317.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/lobupuximilorotavib.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/11969899889.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/88808394831.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/menov.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/govajefe.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_off0000da01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA01 17144 bytes
SHA-256: 514e1bbde769d8645bbf902a56bbbde13f571ad86146dcc9a37265fb060b083f
font_01_sfnt_off00010634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10634 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4B 10892 bytes
SHA-256: 1166af1593fa31bbc119e03fc0860bfd07ad9cbaa120057d66df33a701417617

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