Malicious PDF — malware analysis report

Static analysis result for SHA-256 750986ce14f29fc3…

MALICIOUS

PDF

78.8 KB Created: 2021-05-30 06:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cb90693909e2fc9dcc3388af55c27c79 SHA-1: c7b50d66d2cb5ed91ed6bd753bc77fe86b29aacf SHA-256: 750986ce14f29fc3d16c240ceef0fdee7f0b27609e05b0885f6957d363abf36e
186 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 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://kuzutuzo.ru/strik?utm_term=dosis+de+dipirona+im+en+ni%25C3%25B1os PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4427103/normal_5fe1cf60af75d.pdfIn PDF document text
    • https://medivurufif.weebly.com/uploads/1/3/1/4/131407406/1545635.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408184/normal_5fda6e6785a1f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460966/normal_5ff5c14b30fbc.pdfIn PDF document text
    • https://jefiwosu.weebly.com/uploads/1/3/1/3/131379536/fee9cb497.pdfIn PDF document text
    • https://xajevopo.weebly.com/uploads/1/3/2/6/132682124/xerewupijirufego.pdfIn PDF document text
    • https://wunabigoji.weebly.com/uploads/1/3/4/8/134891590/1304098.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411717/normal_601ed600de19f.pdfIn PDF document text
    • https://lafawifovetin.weebly.com/uploads/1/3/4/3/134369932/rikodizuzerebi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375350/normal_60033597aa493.pdfIn PDF document text
    • https://zobatovegu.weebly.com/uploads/1/3/0/8/130873738/2996945.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486994/normal_5fc8c7f7f024e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387233/normal_5fd6905200344.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/e432613d-8596-425f-8de0-c9f480ec073c/77487515505.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecb27790-05a4-4a13-b0ce-0079bc63e5be/34318442629.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7bf66e3-cd60-40b4-8cd7-4b8d4abce6a8/7766959804.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ee019df-4064-427f-8f28-97ae0e52e47f/is_minecraft_pe_multiplayer_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bcc516c-c4c5-4fb6-b1ca-19fefb2ed522/what_is_the_definition_of_curriculum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c560365f-9996-45d2-b553-9fb69b811684/13785437459.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_off0000f3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3ED 5284 bytes
SHA-256: 58d77a7803c629af3f9b8259c84975bb21a3fd215304fea13c36f340317011c0
font_01_sfnt_off0001058d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058D 11712 bytes
SHA-256: 9d55bdef8cd4338372fdc15ede2ba18711b6c6918d1fec00539acda5d756b717

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