Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee6a4f4813c61b2d…

MALICIOUS

PDF

72.1 KB Created: 2021-02-23 17:52:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c4a9b0fb59260707a351cf9d66d52699 SHA-1: 97d3ce63ce6749470ee6009fd22a2f245aa3be95 SHA-256: ee6a4f4813c61b2dd703054f4b96d14afea954856cc4ff080ab66be5b4900065
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/wix?keyword=soundhound+music+search+apk+download PDF link annotation
    • https://widonudafedezu.weebly.com/uploads/1/3/0/7/130776490/c2eb8e772.pdfIn PDF document text
    • http://rezonansmusic.com/kowatasixofoi56c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367964/normal_5fdbfc7a40ada.pdfIn PDF document text
    • http://blancer.xyz/zesojezapogawowikepafutjh39x.pdfIn PDF document text
    • http://websporizle4.com/65040976478bg8ex.pdfIn PDF document text
    • https://japejezapunat.weebly.com/uploads/1/3/3/9/133999519/tizox.pdfIn PDF document text
    • https://cdn.sqhk.co/tasokuxu/ggVjFhc/polytechnic_university_of_hong_kong_application_deadline.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424951/normal_5fe51be0a9a87.pdfIn PDF document text
    • http://vilopeg.xyz/learn_thailand_freehsbjk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417414/normal_600155a4ec855.pdfIn PDF document text
    • https://jatevabuxises.weebly.com/uploads/1/3/5/3/135382810/80ef2d896.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385217/normal_601bbbc669b9d.pdfIn PDF document text
    • https://tegipogelow.weebly.com/uploads/1/3/1/4/131407588/rewivewupelovili.pdfIn PDF document text
    • https://zibakuponitek.weebly.com/uploads/1/3/5/3/135303957/munudanoposos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://mowumaja.epizy.com/lalabuxezabud.pdfIn PDF document text
    • http://jiwunix.epizy.com/98837791909.pdfIn PDF document text
    • http://xiwagopa.epizy.com/30514709650.pdfIn PDF document text
    • http://jominata.rf.gd/app_lock_fingerprint_password_pro_apk.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD051 5372 bytes
SHA-256: fccb2ac600ae6924bae41c0e3204d11c6523862f96516d48aae82935e9b5f2a5
font_01_sfnt_off0000e259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE259 10136 bytes
SHA-256: d4c14491fe0dda2bab6de2bb9d85a67ea4060c2da646bbdf2919b7e7a81bc72e
font_02_sfnt_off0001051a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051A 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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