Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4596360e9a57b7f…

MALICIOUS

PDF

94.5 KB Created: 2021-02-24 06:58:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: c1aaebabb10f16e1fe7ac08268292546 SHA-1: 11dfa58df928153d818558ac5f421f0a70da24a9 SHA-256: c4596360e9a57b7f8da35b820059b5b1a34d17112d66a91c997c1bd6ef537240
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a mass of external links, many hosted on disposable domains, suggesting a link farm or SEO spam tactic to drive traffic to malicious sites. The document body, though heavily obfuscated, contains metadata related to its creation, which is not directly indicative of user-facing content but supports the file's structure as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/wix?keyword=project+tl+na+release+date PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369306/normal_5fe0da4ecb5e2.pdfIn PDF document text
    • https://tigibivimibi.weebly.com/uploads/1/3/4/3/134344299/2699600.pdfIn PDF document text
    • https://timonuwek.weebly.com/uploads/1/3/4/3/134383578/b6a8b1c553.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501027/normal_601e05175d4c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464083/normal_601b3e43b5564.pdfIn PDF document text
    • https://xelipifexejup.weebly.com/uploads/1/3/4/8/134848770/e7464f8f6024b41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368238/normal_602ebcf026d5c.pdfIn PDF document text
    • https://zekaxuwamawebi.weebly.com/uploads/1/3/5/9/135961115/zakix.pdfIn PDF document text
    • https://jobajepefo.weebly.com/uploads/1/3/1/4/131482915/sevomogifamube.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373264/normal_60175ee9a02bf.pdfIn PDF document text
    • https://wupanotowi.weebly.com/uploads/1/3/1/4/131406855/6cc9416437.pdfIn PDF document text
    • https://bugojexipu.weebly.com/uploads/1/3/1/3/131398417/wumujaxed.pdfIn PDF document text
    • https://sevezumu.weebly.com/uploads/1/3/2/7/132710575/vowus.pdfIn PDF document text
    • http://tojumuwuluso.iblogger.org/95483243844.pdfIn PDF document text
    • https://gaduforijap.weebly.com/uploads/1/3/1/3/131381464/6475614.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367294/normal_5ff284e21fb9f.pdfIn PDF document text
    • https://nawobelif.weebly.com/uploads/1/3/5/3/135307193/265424.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475859/normal_5fd8cc1052ba6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vawuwafakevem.epizy.com/52323225388.pdfIn PDF document text
    • http://mapureju.epizy.com/70718818419.pdfIn PDF document text
    • http://dudolisimak.epizy.com/affixes_wow_guide.pdfIn PDF document text
    • http://tinegomawula.epizy.com/rational_functions_practice_test.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD58 6532 bytes
SHA-256: d68952d96cbb5dfbdf4a306a8afaebf7fca4899d3d98471b58138cf89d01873d
font_01_sfnt_off00010d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6F 2880 bytes
SHA-256: 7b8dc2e5a64f90bab219a61f8e99c3095d289d12905b6b6d4dd88c94e0a34d6a
font_02_sfnt_off000117b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B0 5008 bytes
SHA-256: 844c74a359ebaeec16dc924ff7e550cb593eb6e3e04846eb72d900c7df2f34ca
font_03_sfnt_off000128c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C1 13948 bytes
SHA-256: 741b31dcfd7c42ea65e2022d8205bb623c17a8745528b2ba7142bda0014722be
font_04_sfnt_off000154b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154B7 16076 bytes
SHA-256: 17dc25ffd8be9e1a817a2a629234721e3af5b7f595c0e59e7e7d47d96463b6cf

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