Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c03494da6f303cb…

MALICIOUS

PDF

84.3 KB Created: 2021-09-13 12:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: daa2492017dc940dc3c21a5a88aa5cc3 SHA-1: 582a7453a925d55ae73081b212dc643723ba04cb SHA-256: 7c03494da6f303cb6c1ace4fd4cd647bb6ffb66b1b5c926d7d4ba229f6694dae
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. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16139e9bf5f170---zijaparojupenuzu.pdf In PDF document text
    • http://meteosputnik.ru/userfiles/file/3771898611.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/gigadifisipem.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/39165838074.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/gedowelig.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109040847102949.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/75866766423.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/65569080181.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/sezonavuvus.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/xejivo.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/paminibekutafad.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/dogimuzemivovebukelusaji.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/tumosixijoginuvukoxalibe.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/524746025.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/wojiwezutojagi.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/60471797382.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/gubalofe.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/zerara.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/42767423427.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/55544773852.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/12703197309.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/45793262150.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/negobomewuxudilafesawo.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/91906182307.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/xorixanupakeraxege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=powerpoint+365+loginPDF 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_off0000e4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF9 17720 bytes
SHA-256: 7077650643216ef2d1cb5b89d40774759b42d83df50c32eac4225066f9988d4b
font_02_sfnt_off00012ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC7 10660 bytes
SHA-256: 2d186ad3f64b84778110d3ac945ffe567af105bc1124f8ba440ebd20b138a433