Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5d4c879927f54ef…

MALICIOUS

PDF

105.5 KB Created: 2021-03-31 00:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45ec3a2317ca42bb1580e15677c855a5 SHA-1: 221b0773c7cbd3f30a99a8b9042bf48cb233a958 SHA-256: a5d4c879927f54ef3fac34aff356c8abe861ebd020d8a60667a78e53cf17e788
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the presence of numerous external URLs suggests an attempt to redirect the user to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://kuzutuzo.ru/strik?utm_term=what+type+of+disability+is+developmental+delay
    • https://static.s123-cdn-static.com/uploads/4473892/normal_5ffadc00e7514.pdf
    • https://static.s123-cdn-static.com/uploads/4417030/normal_5feb486e2ec51.pdf
    • https://static.s123-cdn-static.com/uploads/4465908/normal_5feebf3f3ffcc.pdf
    • https://bokesaxigalul.weebly.com/uploads/1/3/0/7/130776824/6379b.pdf
    • https://mabamigetope.weebly.com/uploads/1/3/4/4/134493328/22979c4a25a.pdf
    • https://cdn-cms.f-static.net/uploads/4377647/normal_5fdb0281309ee.pdf
    • https://cdn-cms.f-static.net/uploads/4422135/normal_600c68923e84c.pdf
    • https://cdn-cms.f-static.net/uploads/4368240/normal_6056754be11d2.pdf
    • https://dusimajigedavim.weebly.com/uploads/1/3/1/4/131453199/bevujapebutejezojad.pdf
    • https://vokavubibobudew.weebly.com/uploads/1/3/5/3/135316357/81562d567.pdf
    • https://static.s123-cdn-static.com/uploads/4465539/normal_6009928cc11a5.pdf
    • https://cdn-cms.f-static.net/uploads/4419410/normal_603b0a6b7a83f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5b2221d7-1b44-4c1d-bd25-6b20b8ed802f/jogisukamif.pdf
    • https://s3.amazonaws.com/paxuvagal/ms_sql_server_installer.pdf
    • https://uploads.strikinglycdn.com/files/751a56b2-fa9f-4795-82fd-f97ae59fc474/hcnp_networking_study_guide_free_download.pdf
    • https://52468903-0e2d-47c5-babb-61e1d305d291.filesusr.com/ugd/32777b_c894500d280c4605bb56d2e0a0a67d6b.pdf?index=true
    • https://s3.amazonaws.com/satuja/maxixajaguzebisonas.pdf
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_4d5af11f172f40c7bb52043dd72a04a3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/56bca285-71ac-4ac2-9a93-b6e24c81bcd7/20746862857.pdf
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_17d973446ceb470cbb1887f56acd3368.pdf?index=true
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_734bd283e76c41dda9a0cce06600016b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/690e4045-120d-4605-a572-5dd34e052486/monster_vegan_cookies.pdf
    • https://abaaaae4-9231-44fc-b12c-ad55ebcc68e7.filesusr.com/ugd/2ca09c_ba3afb0257a64495900bab213600f10a.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014800.bin
2ab02d804ffc3e96b603c0015d289a4f0ee2034df3b68761b2692cd7491ce074		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14800 5500 bytes
font_01_sfnt_off00015ab0.bin
19344181a89d474c3cc56a1172e5e2081ea1045743c668f00648e3a0aadb3cff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15AB0 11880 bytes
font_02_sfnt_off00018327.bin
275d0ef8f619a30f75d5b67021c85ffe51dbf44d82a44ecb2d07128ff93f9399		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18327 16112 bytes

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