Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ce45db810b54fa…

MALICIOUS

PDF

84.1 KB Created: 2021-09-13 17:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a397c8bfb07cd2a5d98530d51470386e SHA-1: 31258be2e14ada7a5072560ced94d841dd0385d0 SHA-256: f4ce45db810b54fa54bfdd0092c2c7fc970b1bedd130614ad9f6ab026ddb80d2
166 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The 'SE_CLICKFIX' heuristic suggests social engineering tactics designed to trick users into executing commands, likely by presenting a deceptive interface or prompt. The presence of numerous external URLs, many pointing to PDF files on disposable hosting, further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://wastran.ru/uplcv?utm_term=how+do+i+connect+my+phone+to+my+smart+tv+wirelessly PDF link annotation
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/folefomazomo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2eea0de85---47229872301.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/42548312377.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/73335889071.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/25608425290.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/lunovusiti.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/30132425544.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/wavesabipikedofajibil.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/23041699726.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/25413315608.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/140648430.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/35752518095.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/36883648342.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/tapifufevovalogiwa.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/midetinorenujemida.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/foxurakipizogav.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/3413938096.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/bivulod.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/vitasiterilalofute.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/11617e7076c20fe6147212464e33cf7d.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/dizaw.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/81877933787.pdfIn PDF document text
    • https://gulamanis.com/contents/files/46206605591.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_off0000e303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE303 11036 bytes
SHA-256: 42b34754d1ac4de866444a5619374aae6ab147ae4e534ef2f86467822b52f920
font_01_sfnt_off0000fc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7B 17900 bytes
SHA-256: 5505d6c058c1dbba1337abc49f23a87cf3b23c8242c186a664d9ada28b59220c
font_02_sfnt_off00012ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1