Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c50b24e0f1cc09…

MALICIOUS

PDF

79.6 KB Created: 2021-04-03 19:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3c64a384fd5cf7462cce8fb1274e41e SHA-1: 77b29bc96dd6ddf32eac1e6b2cd3b55e65b80caf SHA-256: 65c50b24e0f1cc09e75434f0317311db5a0e5a36fde63bd7ae0689c57155b444
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files, indicative of a link farm or SEO poisoning tactic. ClamAV and ML classifiers flagged this as a phishing trojan. The presence of embedded URLs and the structure suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/wix?keyword=refrigeration+cycle+enthalpy+diagram
    • https://static.s123-cdn-static.com/uploads/4365540/normal_5feb26ab9a110.pdf
    • http://venira.su/electronically_supplied_services_a_guide_to_interpretationaqbct.pdf
    • https://static.s123-cdn-static.com/uploads/4425005/normal_5fe2a48c02d60.pdf
    • https://cdn-cms.f-static.net/uploads/4474211/normal_605f67395189d.pdf
    • https://static.s123-cdn-static.com/uploads/4423715/normal_5fe1a8d9961a7.pdf
    • http://jajuviramigawo.medianewsonline.com/kojalaxefu.pdf
    • https://cdn-cms.f-static.net/uploads/4382782/normal_605b1a312c941.pdf
    • http://9gusevshop.space/sorcerer_saving_throws69p5c.pdf
    • https://cdn-cms.f-static.net/uploads/4387807/normal_5fe6c4529028b.pdf
    • https://static.s123-cdn-static.com/uploads/4421472/normal_5fec4e622349c.pdf
    • https://cdn-cms.f-static.net/uploads/4456667/normal_600a450c28ad8.pdf
    • https://static.s123-cdn-static.com/uploads/4405179/normal_5ff87f8f75ca5.pdf
    • https://cdn-cms.f-static.net/uploads/4444864/normal_601a38a47e75f.pdf
    • https://cdn-cms.f-static.net/uploads/4494681/normal_60338deeb8a7b.pdf
    • http://kujunat.medianewsonline.com/bill_james_baseball_abstract_1987.pdf
    • https://static.s123-cdn-static.com/uploads/4371025/normal_600517d17c134.pdf
    • https://cdn-cms.f-static.net/uploads/4476270/normal_603f430846b40.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_ca8eec31c13c49f18ca3e6b24cc444db.pdf?index=true
    • https://0d555108-1732-4721-8d72-76d747b2053a.filesusr.com/ugd/1b0481_f582ac96b10f47a6b17b2ab1b35b2ea7.pdf?index=true
    • https://1639490a-f715-481e-9fb1-af38d332269b.filesusr.com/ugd/a59130_8f6651d21c844dcd9d0b3122dd627944.pdf?index=true
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_2e37d0a1d99f4ea2af1def57d54ea197.pdf?index=true
    • http://bodirinukamole.onlinewebshop.net/autodwg_to_dwg_converter_2020_crack_free_download.pdf
    • https://07f52280-50dc-49c2-beec-a2e30bf849d0.filesusr.com/ugd/7b8f90_5d89a8dc4c12489ca7df9e57002a9c6e.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edd6.bin
df255e2bb1a319ff3981b46608dfa9efa2bee04b29b08ce442d46883fca26102		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD6 5288 bytes
font_01_sfnt_off0000ffa7.bin
200e0399ad932c86e4eaca60cafa16d629f1783773987ff040a647ed1de7083d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA7 10472 bytes
font_02_sfnt_off00012345.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12345 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.