Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bae4e2ad437dc50…

MALICIOUS

PDF

86.0 KB Created: 2021-01-30 02:00:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f6f0d33e73bf771eed16f9441844fc04 SHA-1: b98c56bc1ece1dc6faaae361f235a4f7946a0ece SHA-256: 2bae4e2ad437dc50182ba4e20f4320c8b85d4988e1139b42a57516b19b2d6130
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://jacksth.ru/123?utm_term=power+cycle+thermodynamics+pdf PDF link annotation
    • http://crubr.space/skylands_urgent_care_franklin_new_jerseyeuuge.pdfIn PDF document text
    • http://momentikshop.space/era_of_celestials_code_2019n4wp5.pdfIn PDF document text
    • https://nuzozixajalupik.weebly.com/uploads/1/3/0/7/130739607/302324.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453551/normal_5fc5ac0f44137.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459177/normal_5fe8e4b2bddd8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367275/normal_5fccd1e6bd54b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387567/normal_5ff0ed66425bc.pdfIn PDF document text
    • http://musofiron.ru/the_college_panda_sat_writing_reddit0opom.pdfIn PDF document text
    • http://boost-shop.xyz/sugazugemugezunw0s7n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459166/normal_5fe121e0ae87f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393029/normal_5ffe2050eb472.pdfIn PDF document text
    • https://cdn.sqhk.co/lufezeralon/FgcWcMH/87868326101.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503279/normal_600fc42ecc826.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/21539611843.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
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79F 5592 bytes
SHA-256: 8573d2b4c279d9da4dd4dda921fbc6ec76a9b7be670af8302b7f35faeb7b3264
font_01_sfnt_off00010a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8D 12580 bytes
SHA-256: 88c16cd07823f459c24c4068e1b20f157f3010fc23eb65316860778d1b4a0069
font_02_sfnt_off000134c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C6 16252 bytes
SHA-256: d5c38e03135bee0b6e65897861adc2f8746fc30880a60f93a0039bbaac06f398

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