Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba09ef941cfd4096…

MALICIOUS

PDF

79.1 KB Created: 2021-06-07 09:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88a79b664494775347cd18d36c42eb14 SHA-1: ae0eb56546529ddfc41df35253b067f5c0cefbaa SHA-256: ba09ef941cfd4096d7a945708cc11b20025c6e775ca7c6f29be67554b339ac7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The PDF contains a link farm with numerous external URLs, suggesting an attempt to redirect users to potentially malicious sites or for SEO manipulation. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nomylo.ru/pbw?utm_term=how+to+get+free+robux+without+a+code
    • https://static.s123-cdn-static.com/uploads/4479213/normal_5fde3651d8e6f.pdf
    • https://static.s123-cdn-static.com/uploads/4421462/normal_60039823d84bb.pdf
    • https://zuwubusonelab.weebly.com/uploads/1/3/0/7/130739898/gigelirelujavufe.pdf
    • https://cdn-cms.f-static.net/uploads/4460466/normal_5fd949e9897b8.pdf
    • https://cdn-cms.f-static.net/uploads/4472788/normal_601d8ff12a987.pdf
    • https://cdn-cms.f-static.net/uploads/4464870/normal_6060caad1db18.pdf
    • https://cdn-cms.f-static.net/uploads/4371800/normal_604e2e653af10.pdf
    • https://static.s123-cdn-static.com/uploads/4369189/normal_5ff26c2fc21c7.pdf
    • https://static.s123-cdn-static.com/uploads/4501057/normal_60063444e5f93.pdf
    • https://cdn-cms.f-static.net/uploads/4457332/normal_60480ecc0b0d6.pdf
    • https://static.s123-cdn-static.com/uploads/4494866/normal_6004751ad7cdb.pdf
    • https://static.s123-cdn-static.com/uploads/4366319/normal_5fed1e0f1c9f6.pdf
    • https://cdn-cms.f-static.net/uploads/4425933/normal_605302115e8d5.pdf
    • https://rafunipigadim.weebly.com/uploads/1/3/1/3/131380466/5573036.pdf
    • https://cdn-cms.f-static.net/uploads/4443329/normal_60660e8ad83a5.pdf
    • https://gezofixerofale.weebly.com/uploads/1/3/4/4/134458649/7069821.pdf
    • https://cdn-cms.f-static.net/uploads/4379048/normal_600a3b7608fc5.pdf
    • https://mubikopupisuf.weebly.com/uploads/1/3/4/7/134711770/vovevavevufifaz.pdf
    • https://cdn-cms.f-static.net/uploads/4380681/normal_601149a1cb18d.pdf
    • https://webupusew.weebly.com/uploads/1/3/5/3/135344455/b8c54.pdf
    • https://cdn-cms.f-static.net/uploads/4383295/normal_606b7aa1d2cf5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mujefapufefi.pbworks.com/f/daemon_tools_lite_10_crack_serial_number.pdf
    • http://gapufipi.pbworks.com/w/file/fetch/144656745/gafaxivovilowavominizufu.pdf
    • http://kibumezi.pbworks.com/f/smallwood_piano_beginner_book.pdf
    • http://zudilazo.pbworks.com/f/17236192772.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_off0000f6e8.bin
f72c7b00996154626bfbfd513e3667c72adfe5eb49ffed1ba6a6b8f4c9c68d5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E8 5336 bytes
font_01_sfnt_off00010922.bin
31f796057f6551730e24496a7d87ba6971bb89fe68e2445b2307540fe87822b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10922 11072 bytes

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