Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8895a1ac142b2e…

MALICIOUS

PDF

75.8 KB Created: 2021-03-19 23:44:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 035041d33fe0687eb3c43b75c9f46a60 SHA-1: ef3528e9103bd40a3a8dce7e400d7dff25dc2559 SHA-256: 4a8895a1ac142b2ed3e4ffee79892dc947e4fd913869f0c7868d834b2325510e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the structure suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/strik?utm_term=weber+spirit+e330+parts+list
    • https://cdn-cms.f-static.net/uploads/4371266/normal_602d9fd1461c7.pdf
    • http://tufodudem.mypressonline.com/nowum.pdf
    • http://gatowixipeba.mywebcommunity.org/57409118194.pdf
    • http://finonit.mypressonline.com/52796617893.pdf
    • https://cdn-cms.f-static.net/uploads/4368471/normal_603dd062ebf4d.pdf
    • https://cdn-cms.f-static.net/uploads/4407788/normal_601879aa9f7ac.pdf
    • https://cdn-cms.f-static.net/uploads/4470545/normal_6054bf37947e4.pdf
    • https://kewojuposadut.weebly.com/uploads/1/3/4/3/134374438/jepukul.pdf
    • https://kijujiwovijuk.weebly.com/uploads/1/3/1/4/131453096/6706341.pdf
    • https://static.s123-cdn-static.com/uploads/4369506/normal_5ffdbd5ed0236.pdf
    • http://tuvosudokalidu.scienceontheweb.net/application_for_schengen_visa_austria.pdf
    • https://woxamaxepid.weebly.com/uploads/1/3/0/7/130776503/5365093f0bd335.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/19c94d1e-f82e-4641-a52c-44ee833029ca/course_2_chapter_1_ratios_and_proportional_reasoning_answers.pdf
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_def59cb6d2874e4bad5db54bdba9447e.pdf?index=true
    • https://ab737b70-891a-4a1f-8db9-ee548211cb31.filesusr.com/ugd/ce14f3_0d025e4996e643a0984883cae5e55921.pdf?index=true
    • https://uploads.strikinglycdn.com/files/190c1544-4615-40c1-92f9-14eb495a1291/what_is_a_kanso_sound_processor.pdf
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_05ceca18c3884aafaf55848ec19735e9.pdf?index=true
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_1e4bdd9147724d8a935d33efa57be4cc.pdf?index=true
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_7fcca15a2ebf4d4193963782109a4fc9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e81e280b-b1dd-4516-b174-fe500d2f820d/fumivomuforolegeduviw.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_off0000eb7f.bin
8ffba3acf40704a9e721b2bbad1c3cc221aa75ccdc788250cefe6faa9a384df7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7F 5272 bytes
font_01_sfnt_off0000fd82.bin
3a087687217d2704926360af72486935a3023f967bd600f19195c818e546c21f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD82 10304 bytes

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