Malicious PDF — malware analysis report

Static analysis result for SHA-256 49f8d322c7d70109…

MALICIOUS

PDF

73.8 KB Created: 2021-03-22 19:25:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a3b6a751e099d52721cb1c4dba4b7fd SHA-1: 70b10eb31d88dde7b7bd87e90f2f876f9970437c SHA-256: 49f8d322c7d701096ce62b8f5036e5f946039805151dc27b894a28db3e510968
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, identified as a link farm. One of the primary links, https://vilenefex.ru/wix?keyword=words+that+begins+with+h, suggests a potential phishing or malicious content delivery vector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/wix?keyword=words+that+begins+with+h
    • https://cdn-cms.f-static.net/uploads/4389361/normal_5fe61d72477e9.pdf
    • https://datipozor.weebly.com/uploads/1/3/0/8/130813945/vanebes-vulepesati.pdf
    • https://static.s123-cdn-static.com/uploads/4476567/normal_5fc807618786c.pdf
    • https://muluxadi.weebly.com/uploads/1/3/1/4/131453645/fitonodaluvamijowe.pdf
    • https://juxusuvib.weebly.com/uploads/1/3/0/7/130739690/2159924.pdf
    • http://vodabutopidaru.getenjoyment.net/zizarusuzojos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1d2f9c5c-f911-40a1-9e62-ff6c49452e51/18200219686.pdf
    • http://fetekovabu.onlinewebshop.net/room_on_the_broom_download_free.pdf
    • http://vejiwulig.rf.gd/79669254902.pdf
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_1d4cef5f87574f349cbebc00fd13c7a5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/13a60df4-72cf-4870-8380-7b7bb5e87b00/power_pressure_cooker_xl_recipes_beef_stroganoff.pdf
    • https://uploads.strikinglycdn.com/files/c38a8c34-3bd1-492b-9d35-53556780a2d7/87585194861.pdf
    • https://156bb51f-0b62-477f-88ca-8620af00812b.filesusr.com/ugd/e3ff21_2b654646e24c48178176d284594fb0e9.pdf?index=true
    • https://6ba7316d-b84b-4ccb-a32a-103c856d4013.filesusr.com/ugd/91f37e_8025b14003af49bbb84851ccacf0ebe4.pdf?index=true
    • http://vibulowivez.epizy.com/82919986396.pdf
    • http://rovizomaguwex.atwebpages.com/parasitic_diseases_book.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3ae.bin
81c0621b59ce10b4c63dff2f66521d1d8d9402347ad7fedbae29cb1182d0f2bd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AE 5300 bytes
font_01_sfnt_off0000f5c1.bin
b44a6fdfebc1296eed2b95dced6a9224f32314c47e1d439eb33c04f3f222d281
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C1 10704 bytes