Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f33215cc04f90bc…

MALICIOUS

PDF

88.4 KB Created: 2021-05-27 15:34:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0dc4ad6da147ffc174cd6aadfc918186 SHA-1: 5915a9cf07b7dd498f2ed4ed7030168490d3785c SHA-256: 8f33215cc04f90bc30bcb9c59dc542d4bf40651b2fd0f2b34de10becc70f47e1
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://nipisod.ru/strik?utm_term=divina+commedia+canto+xiii+inferno+testo PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4478946/normal_5fc8d5ce87ce8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373776/normal_606626595390a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424029/normal_605d9e0b6a8e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486765/normal_6022a8ae20c0b.pdfIn PDF document text
    • https://gujavaluzosozu.weebly.com/uploads/1/3/4/0/134013303/kakakog_mimapuku_mulotawot_novibepivan.pdfIn PDF document text
    • https://wevapagavum.weebly.com/uploads/1/3/4/3/134306171/wolasok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/88966a18-a3b2-4ad4-847d-d0c53f1ce8e2/phonological_rules_and_processes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/109cf802-182b-4898-8ac5-be095bedb020/english_grammar_book_download_in_gujarati.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5f03bac-98f4-4471-8dba-79533c5d06d9/towers_of_high_sorcery_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/714e4041-ebba-483a-b52f-65a53d05acd8/fopegekamifil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4644d2f7-6ec9-4360-b966-819f90c2ef18/towaxebazodamusupigazuje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1aee6a2-e7ff-4a46-97eb-1b50e6bdf24f/xuwafurugatefafifisas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1e71c52-e636-472a-b04e-519effb783af/what_does_the_class_president_do.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a1f7456-c530-4f9f-99fd-0a49f17ba33c/pisumipimugez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/667a5a71-040c-404a-9a61-498dd94554c3/authors_purpose_graphic_organizer_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81f98dbe-4ae2-4505-b172-ed2e76eb50f2/gosuvozokusogemafako.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A47 5260 bytes
SHA-256: e027bf89979cc84359454a27084d719652c3a90d147fb5206604d4fd1d38fe41
font_01_sfnt_off00012c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2A 11888 bytes
SHA-256: b05dde73818f6da3a456476cef718af6323278f1a1149d7f9e1664954ec17fcc

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