Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f16266874966074…

MALICIOUS

PDF

74.7 KB Created: 2021-03-29 12:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c1dc1a63c0fdedba31c5e5a113a2313 SHA-1: d3b056ef2e6dc8588995223419432d01894f5f21 SHA-256: 9f162668749660747886bb8cb6aaf74c5ed659bf29fb85e6587934f9c3247830
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The document contains numerous external links, with one prominent URL pointing to a site that appears to be part of a link farm designed to distribute malicious content. The presence of these links, combined with the document's deceptive title, suggests a phishing or malware distribution attempt.

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-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://soxebez.ru/wix?keyword=prentice+hall+physics+answer+key+2018
    • https://static.s123-cdn-static.com/uploads/4454287/normal_5ff2b1aae7199.pdf
    • https://cdn-cms.f-static.net/uploads/4462345/normal_5fda640c91158.pdf
    • http://frasqen.online/judememamujusut8fej8.pdf
    • https://static.s123-cdn-static.com/uploads/4417662/normal_5ff0157da9e4f.pdf
    • https://cdn-cms.f-static.net/uploads/4371553/normal_603d1680e4186.pdf
    • http://leree6.club/97396940103friy8.pdf
    • https://cdn-cms.f-static.net/uploads/4409238/normal_604a9d0e98d49.pdf
    • https://static.s123-cdn-static.com/uploads/4475719/normal_6007b1911ef91.pdf
    • http://psychologyrelax.xyz/jands_vista_2_controllerb349n.pdf
    • http://beautytopshop.site/xilikamototegenepuvadbda4.pdf
    • http://brandframeb.com/2659659575apigc.pdf
    • https://cdn-cms.f-static.net/uploads/4403679/normal_60241546da789.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bcbc83ff-a82b-4234-bf1d-c69e8cae54d5.filesusr.com/ugd/057c82_6c7fa926d40a4ba5aba571850586bf29.pdf?index=true
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_cf9c531cabf64453aa71d3ce5e982af6.pdf?index=true
    • https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_031b679826c14c0f9947bf26e7a9cdfd.pdf?index=true
    • https://ba428ff1-d53d-4eb5-bdb2-cc960067f420.filesusr.com/ugd/7041e4_c6c2fbe48769496785876f2317cccfb1.pdf?index=true
    • https://5e7fdb44-65a6-4d88-9b36-b69c04d36e08.filesusr.com/ugd/b547b4_fe958e6ff80a4c8fbcea4584d7245f8c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/48f754f6-b1e7-44b3-b08f-fcee502f6dc0/rutibat.pdf
    • https://1423d76f-a56f-4481-bf87-726e17039346.filesusr.com/ugd/14aee2_54f26972787a4016a6c9b8464337ca44.pdf?index=true
    • https://d52aed46-be45-4f9b-8106-cf6fc7ee66c0.filesusr.com/ugd/b148e5_1d8f01b72a8b4ec3adb31ebbeaf87f11.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b7e0b2a5-c2e6-473f-b258-bb6ce5546c39/life_after_life_raymond_moody_summary.pdf
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_f4370c8d1ca748ed815f52adb7580071.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8a4d91a8-90dc-46b3-9bea-fd177f84916f/scott_foresman_math_grade_4_online_textbook.pdf
    • https://uploads.strikinglycdn.com/files/02fa5103-8e5b-4d23-ac14-9fc608d68215/either_or_a_fragment_of_life_by_soren_kierkegaard.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_off0000e6bd.bin
54e07e2a069e48624f3ff08a51366afb20aac12476b30726dafbdb56b9770988		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BD 5800 bytes
font_01_sfnt_off0000fa93.bin
2c534d49c9e04e85434eb2a09c4f846cfd32e5ab26d3f48bf6d672081ca12017		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA93 10112 bytes

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