Malicious PDF — malware analysis report

Static analysis result for SHA-256 e442a1ae947c685b…

MALICIOUS

PDF

84.5 KB Created: 2021-09-12 19:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9cc6597ae7fd958c8d63b463904b517e SHA-1: 38af0b15e53560f2f9df2be44d14e5e26313db1d SHA-256: e442a1ae947c685b078de7e6fbc7e2c87c722bd679dc60365c9cda27f9982085
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host a large number of links, likely for phishing or malware distribution, and the presence of external URIs further supports this. No scripts were extracted, but the overall structure and URL distribution point to a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://allytemp.ru/uplcv?utm_term=android+automotive+os+book PDF link annotation
    • http://woodbridgeabw.com/uploads/files/tijejotefiwedurusa.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/46100824587.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210901_C22215CD33E9D566.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/53278159227.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/14955664998.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/xiwebinemup.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/xiviwix.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613289c703d61---geganijijaf.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/jowusinitabilikosef.pdfIn PDF document text
    • https://webaprint.be/img/file/rosodizu.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/wanif.pdfIn PDF document text
    • http://livestocktool.com/d/files/73290462566.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/penobiweguw.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/katenir.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/96451542348.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/mnkdi6tgjr7p7fr9tap3pqt0q6/relupujudoposisavirog.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/62815054379.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210907_064916.pdfIn PDF document text
    • https://netpage.info/userfiles/file/vujikiri.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/29592052147.pdfIn PDF document text
    • https://unitjaya.com/contents/files/tolesogefu.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/gugudakaxuwo.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/futitojiziv.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_off0000e1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C3 10740 bytes
SHA-256: ecf9ec4fcacecaec87c9ef6c342c8152bf1b73b5fb9eea1a5da6be24d5e3e763
font_01_sfnt_off0000fa81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA81 19020 bytes
SHA-256: 61bd29f1c6766d741eb6a20de21299755a7c02e3ad8988676112ce7207395d19
font_02_sfnt_off00012c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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