Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a30d38f9eefa5e0…

MALICIOUS

PDF

123.0 KB Created: 2021-04-17 23:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 962616967f1c0d3977d5fda29d119c80 SHA-1: 5bf8092a613789c99ca5d19034f5686bedbfc7e2 SHA-256: 7a30d38f9eefa5e03e0288727391a3eb2d3694e4f0ad09bd5ae28c3b5b2689f0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files hosted on various domains, indicating a link farm or SEO poisoning attempt. One of the primary external URIs points to a URL that is likely malicious, suggesting the document is part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=verbos+regulares+e+irregulares+en+pasado+y+presente+simple+en+ingles+y+espa%25C3%25B1ol
    • http://ruzamaji.getenjoyment.net/88095213203.pdf
    • http://liberum.sportsontheweb.net/76945098878.pdf
    • https://static.s123-cdn-static.com/uploads/4481402/normal_5ff65d08c912b.pdf
    • https://kitowido.weebly.com/uploads/1/3/5/3/135348724/salunuzagu_jebodimeg_jitonomele_dewuzum.pdf
    • http://zoguponuwuxoli.medianewsonline.com/34927163720.pdf
    • https://xonunomimir.weebly.com/uploads/1/3/2/6/132681278/gurovelufuxijavisas.pdf
    • https://pewituzusab.weebly.com/uploads/1/3/0/8/130874049/d759e43ad93d6c.pdf
    • https://boxotajisosuni.weebly.com/uploads/1/3/6/0/136086252/joxewudusedavuruliw.pdf
    • https://xegugunozom.weebly.com/uploads/1/3/1/4/131482992/3455555.pdf
    • http://lomuwugevona.getenjoyment.net/87917966689.pdf
    • http://vozobatenaw.mywebcommunity.org/preschool_math_curriculum.pdf
    • https://cdn-cms.f-static.net/uploads/4483864/normal_602e0d3da97c3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gizixaxeviduf.myartsonline.com/athanasius_on_the_incarnation_summary.pdf
    • https://uploads.strikinglycdn.com/files/3c310dff-3ea4-42c8-8ce0-9323c939461e/tafetosodidopew.pdf
    • https://uploads.strikinglycdn.com/files/5d169f35-fd80-4282-ba29-26124d75e3c4/what_skills_are_needed_to_work_in_hr.pdf
    • https://uploads.strikinglycdn.com/files/b452d47d-860d-4fef-9c5f-2f75e7fcfb00/dd_5e_character_sheet_online.pdf
    • http://vepitejususas.atwebpages.com/procreate_apple_pencil_lag.pdf
    • https://uploads.strikinglycdn.com/files/9022a1c9-89d3-41d9-bf45-45a1d51f671f/68597341117.pdf
    • https://uploads.strikinglycdn.com/files/ac0ee045-6764-48ad-87d5-decf5829d164/oppo_bdp-105_review_stereophile.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_off00019f91.bin
6c18b9ee2bb6989b4b11e3bd19631f7f5b0da45ed2ccb4be95e218f49c65f500		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19F91 5696 bytes
font_01_sfnt_off0001b29e.bin
23928ce47688f0d83006183f04cb9a68f4489558f411d6dfe7c23f33bbc7fc24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B29E 12484 bytes

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