Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa78d1729889ae30…

MALICIOUS

PDF

81.0 KB Created: 2021-06-02 22:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d172e7c0d4240c13e8faaba784df5167 SHA-1: dbe6945731928fea58a0a16cd16c7aa5e205fbec SHA-256: fa78d1729889ae3095f2f845f5991715cf4e436278bafcbd0cfc43d5b3a1abc5
96 Risk Score

Malware Insights

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

The file is a PDF that contains an embedded URL pointing to a phishing site. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The embedded URL is likely used to deliver a malicious payload or redirect the user to a credential harvesting page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://pistant.ru/pbw?utm_term=basic+c+programs+asked+in+interview+with+answers+pdf
    • https://static.s123-cdn-static.com/uploads/4485005/normal_5fc93f1492e1f.pdf
    • https://static.s123-cdn-static.com/uploads/4464852/normal_6002c58d4363d.pdf
    • https://cdn-cms.f-static.net/uploads/4495402/normal_5fd66c927bcbd.pdf
    • https://cdn-cms.f-static.net/uploads/4471099/normal_6018c354410d3.pdf
    • https://cdn-cms.f-static.net/uploads/4459329/normal_6069954052a86.pdf
    • https://cdn-cms.f-static.net/uploads/4476757/normal_602efb969206a.pdf
    • https://static.s123-cdn-static.com/uploads/4387813/normal_5fdec9af6dfb2.pdf
    • https://cdn-cms.f-static.net/uploads/4471236/normal_602ee04b12de2.pdf
    • https://static.s123-cdn-static.com/uploads/4369645/normal_5fc869afeb703.pdf
    • https://cdn-cms.f-static.net/uploads/4419425/normal_605a02a5969f4.pdf
    • https://cdn-cms.f-static.net/uploads/4388611/normal_606b5bc236d6d.pdf
    • https://static.s123-cdn-static.com/uploads/4450514/normal_5feedc3332ca3.pdf
    • https://cdn-cms.f-static.net/uploads/4454973/normal_602cf535978a9.pdf
    • https://static.s123-cdn-static.com/uploads/4425209/normal_5ff57e0121adc.pdf
    • https://static.s123-cdn-static.com/uploads/4422371/normal_5fff2c236d4dc.pdf
    • https://cdn-cms.f-static.net/uploads/4378599/normal_6044cba9d7bba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://veniwusuj.pbworks.com/f/simbolos_de_tablero_carro.pdf
    • https://uploads.strikinglycdn.com/files/c6cdff91-cbd2-44b2-a787-6cd88cf979a4/20281478513.pdf
    • https://uploads.strikinglycdn.com/files/1b33243f-5239-47a2-ae7e-ba2db79bae65/what_are_the_8_elements_of_sculpture.pdf
    • https://uploads.strikinglycdn.com/files/557b22e3-b04b-4d9a-ad81-46bd17b50c68/xupofadegaxutogabod.pdf
    • http://wiliser.pbworks.com/w/file/fetch/144474762/how_to_replace_the_hose_on_a_bissell_spotbot.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_off0000fc26.bin
b1e7aa8ea5f182d52579a8db15dcff5a16df085c03a3e195df2362cb394456c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC26 5800 bytes
font_01_sfnt_off00010fda.bin
b61c6d615e1dea0a98c46a44b6bb516901db3e2e2b5d9ee387e8a87854f635ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDA 11228 bytes