Malicious PDF — malware analysis report

Static analysis result for SHA-256 c44e1549580f95d5…

MALICIOUS

PDF

73.9 KB Created: 2021-05-28 19:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: a160c94b30a2c1c0a559c7f1b6ea0ca2 SHA-1: 9553d58c78e7c1b9b3cef77a45b96a7571f5e42b SHA-256: c44e1549580f95d5c69ee73d7459781661937f890000d82b5c128fa0825e29f7
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm, indicating a large number of external links, with one pointing to a diet-related topic. ClamAV detected it as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. The presence of numerous external links suggests an attempt to redirect users to potentially malicious content or for SEO manipulation, aligning with phishing or malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8648

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://static.s123-cdn-static.com/uploads/4387419/normal_5fdec8b636cf5.pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4460725/normal_5fcbd497c08ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447885/normal_6020356641eb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372076/normal_6017cd1fcba0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474736/normal_60162437341fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373770/normal_601481d0cffd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458616/normal_605841c37ebd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471719/normal_6044614354e01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464068/normal_5feb012a11712.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367622/normal_6066f696dfc87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423136/normal_60278b0fe9dcf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383444/normal_5feb81dd14b2a.pdfIn PDF document text
    • https://kojiwoxoposegig.weebly.com/uploads/1/3/4/1/134108885/juruk.pdfIn PDF document text
    • https://kukonugaxa.weebly.com/uploads/1/3/5/3/135327287/263274.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480880/normal_5fe793a128dda.pdfIn PDF document text
    • https://sopazamiwurigu.weebly.com/uploads/1/3/4/3/134387891/874088.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448558/normal_6052b44738e2d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/Ecv9gJ3Ok6E/wb?keyword=south%20beach%20diet%20gluten%20free%20phase%201%20food%20listPDF link annotation
    • https://uploads.strikinglycdn.com/files/33fd3a10-9905-4315-8870-6baefb25e71d/xfinity_x1_box_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de53d48c-af30-4875-93db-4a7bc2fa5b66/hp_officejet_pro_8620_ink_cartridge_problem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bc0e055-1365-49a7-a2c3-fceda7f5f402/23042014993.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67bd4c8b-d3bc-4212-94e3-fa2656a17087/88344166909.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37ec04d0-ea3e-4b83-bc3e-77bbe4cfa221/compare_and_contrast_essay_examples_2nd_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/535cfac0-92c2-484e-bd8e-d47f69055715/nogozege.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF535 5712 bytes
SHA-256: 4e3f34037421c78dd32ca9d73ca2f106adbc9fd183a4fee899d71b0abf4106bb
font_01_sfnt_off000108a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A1 11036 bytes
SHA-256: 7bceba05e4a57c5d5a7ab26c562127dcd8acc35f90d06a619d8984e6bd3f2cfa