Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc4ed4a95782fe17…

MALICIOUS

PDF

87.2 KB Created: 2021-09-18 07:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4b2a49037eec2d5e217302dfd7053052 SHA-1: 923fc4ba793dacdf374c4c91d033f5771f143585 SHA-256: fc4ed4a95782fe17036d5bc4301f4165bb764df53f4a03c8700c63aa61c57c75
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=internet+on+phone+slow PDF link annotation
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/29808802170.pdfIn PDF document text
    • https://rubfila.in/files/file/xolamopefumi.pdfIn PDF document text
    • http://citty.org/images/uploads/file/wofafibegov.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/96286379244.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/ligeriwadabe.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/19566224901.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/39482926522.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/winam.pdfIn PDF document text
    • http://integrotech.com/zdjecia/file/60804422885.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/49574917665.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/fimeli.pdfIn PDF document text
    • http://snsi.jp/image/news_file/25925157557.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109051456357588.pdfIn PDF document text
    • https://polandpools.com/contents/files/98467777427.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387465297c5---95503839567.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a0fcad515---42088886416.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/duxibisufaxuseg.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/xosasotusoze.pdfIn PDF document text
    • https://drlanda.hu/user/file/35314829754.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/wusiwuwul.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/89551045121.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/35333428323.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/52182299853.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/saxaloxinetizuvojuzefu.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/lunujugifaguget.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_off0000f150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF150 18040 bytes
SHA-256: 893af4acf7f74f5efdf0b429983cbec955091351e6850ceec7d50a1b82f8ca02
font_01_sfnt_off00012053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12053 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001386a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1386A 10132 bytes
SHA-256: 38fe0cbab5dcc44a960cbf5a8ea3cb1755d4a7f6d048b95ced5e29906123882a

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