Malicious PDF — malware analysis report

Static analysis result for SHA-256 8845cae59873cc8c…

MALICIOUS

PDF

106.2 KB Created: 2021-03-18 23:24:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0ac16b377f21749eadbbc6fca8444b3d SHA-1: 8c7beca3022d331a7c5ece2f749607cd41309926 SHA-256: 8845cae59873cc8caf612b5e7408f2864396db6253423c3de885fda842daafc1
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://mezovuduw.ru/award?keyword=cefepime+davis+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473954/normal_602d448b30d88.pdfIn PDF document text
    • http://xufamorazogubov.sportsontheweb.net/what_greek_god_is_thor.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/2fjdugc/candomble_religion.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454803/normal_5fd072d24490d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471275/normal_601910b05f9d9.pdfIn PDF document text
    • https://cdn.sqhk.co/kosifodalab/dOPHGib/naxajuvidirukigezuf.pdfIn PDF document text
    • http://peromopativej.mypressonline.com/81543377606.pdfIn PDF document text
    • https://cdn.sqhk.co/zubejavaxuvu/0Irihib/emergency_room_near_me.pdfIn PDF document text
    • http://zonixutazexe.iblogger.org/hp_laserjet_1320_printer_cable.pdfIn PDF document text
    • http://wopebexe.66ghz.com/79286207302.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407057/normal_603dedf25b3c9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xerivigop.rf.gd/how_to_check_diode_condition.pdfIn PDF document text
    • https://95049c82-e412-4913-a0b0-e03e83d5170a.filesusr.com/ugd/127d6e_0124f1f6ea4a4e43a1ff9a9a6d8ea60b.pdf?index=trueIn PDF document text
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_b165c5beda4f44b8bfe0ef169df8af66.pdf?index=trueIn PDF document text
    • http://gevitejivojo.rf.gd/16140103309.pdfIn PDF document text
    • https://e5aadbcf-511f-4ee2-989a-4410a22eeed0.filesusr.com/ugd/64930c_66a32b6881fc4ebab5bfda0268da714d.pdf?index=trueIn PDF document text
    • https://4dcfe184-cd6c-48f8-9f23-5461c743a1d4.filesusr.com/ugd/cc8533_cad4fd33f3e24b84adf671a422fde8bf.pdf?index=trueIn PDF document text
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_48d654c568524b91820ab2649770f900.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16167 5024 bytes
SHA-256: 27279b1af572916708a6af425df7fd95eff38cc8042c549eac6e311d6590b5e1
font_01_sfnt_off00017278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17278 12272 bytes
SHA-256: 0c4aabaf5482e9d8cba7b89caf61ade2ec0e480457a03ef734ffcf56f071a0e9

Open this report in the interactive analyzer, or submit your own file for analysis.