Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b26fb86734dc2e1…

MALICIOUS

PDF

91.1 KB Created: 2021-06-08 21:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 436464bea94c67f7965cd5420c7692cc SHA-1: c4d9a84ece505fe2402ee3d4a351be045bea93d4 SHA-256: 4b26fb86734dc2e1313ae0be65c241e184f28d55e7212cc9a2784d326ff6a87e
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://krisoc.ru/pbw?utm_term=zero+first+second+and+third+conditional+examples PDF link annotation
    • https://fagovuwafarawa.weebly.com/uploads/1/3/4/0/134042706/dijoz-sonovaj-tezifovi-sowine.pdfIn PDF document text
    • https://sinipipa.weebly.com/uploads/1/3/0/8/130874509/8098747.pdfIn PDF document text
    • https://besajovepew.weebly.com/uploads/1/3/4/6/134633036/b39d58025c78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408866/normal_5fd88fd49f9cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414867/normal_602953f412279.pdfIn PDF document text
    • https://nikigefewava.weebly.com/uploads/1/3/0/7/130775032/6463626.pdfIn PDF document text
    • https://loxazofobel.weebly.com/uploads/1/3/4/2/134265844/cef47aa.pdfIn PDF document text
    • https://nidexopike.weebly.com/uploads/1/3/1/4/131407316/vobug.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4501361/normal_60b092367b742.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488336/normal_5fd622e139486.pdfIn PDF document text
    • https://xisevulatunetu.weebly.com/uploads/1/3/4/5/134595014/d0621e.pdfIn PDF document text
    • https://jupawipomilat.weebly.com/uploads/1/3/2/7/132741176/3b33f5c81eb4971.pdfIn PDF document text
    • https://xumolatakikekum.weebly.com/uploads/1/3/4/3/134335049/pefozowinuvex_nozavatid.pdfIn PDF document text
    • https://biwoponafi.weebly.com/uploads/1/3/4/7/134767969/333aa.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/2662b300-4fc8-4e6a-83ca-551b82827b5f/common_core_expanded_form_5th_grade_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21d3c9a5-2071-4c35-b716-3ee296c2490c/kenmore_series_700_washer_wont_turn_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad994aa2-493e-456a-b3c6-5fe1998e18e1/46080923098.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/499845cd-d8a8-4a46-b8e3-0c0ce16900ac/topaxusosesavixojatosazut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/015b74a5-acb8-45ff-86ed-51dbf03f6141/puzetivuseter.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_off00012885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12885 5420 bytes
SHA-256: 9404f6394359e74ba4613ebfb896b5d878bc75937dd512ecc5453fd6ce822919
font_01_sfnt_off00013ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD2 10532 bytes
SHA-256: cb57b810d41f9ee720e57d6f6a9d5852fbc4b8d0d03ae411762595d5c03d92d8

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