Malicious PDF — malware analysis report

Static analysis result for SHA-256 af6b1744e264e3e0…

MALICIOUS

PDF

75.7 KB Created: 2021-05-29 20:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b33b40c94e0089a66cce10a8602b1ebf SHA-1: aedb1528a3f7922c12a2beed656ab34bbef8eba9 SHA-256: af6b1744e264e3e05db7df9612bbe4f8a6fd9ac7149bcb80ae170434b99c0364
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://baarspo.ru/strik?utm_term=libro+negro+de+autos+pdf PDF link annotation
    • https://kunobile.weebly.com/uploads/1/3/4/5/134517695/1776304.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366973/normal_600ff207e7783.pdfIn PDF document text
    • https://xogepojofaridel.weebly.com/uploads/1/3/2/7/132741214/vufuritekexi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369779/normal_5ff09470004aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408863/normal_6006ae4f27d2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454302/normal_605adeb545278.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466662/normal_601ce98d59a7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409413/normal_604ff106e27bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465919/normal_60349605c5b02.pdfIn PDF document text
    • https://fujubonutebi.weebly.com/uploads/1/3/4/2/134266124/ruvunisejoja-belep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369308/normal_60043fa901e2a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417543/normal_5fedfdf46ce49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474223/normal_60152c0d0f74d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378379/normal_6027c5c1c98fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366401/normal_5fde9170accb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473375/normal_60216172356b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369504/normal_60258c12a1cf1.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/b99ac4b6-02b7-40a1-8b9a-c529a95cc553/88417694306.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fdc6643-ea0c-43b4-8c52-654acf32a229/adverbial_phrases_worksheet_year_5.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_off0000e969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE969 5260 bytes
SHA-256: 48e9d619a42ac69349017a99bb5a0a86314f50cadd7e238e683c4a1bda5aea17
font_01_sfnt_off0000fb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB59 11836 bytes
SHA-256: a4f8b3123362650a3bd99d194858fae50b106839be553a3995a9d6b30ca8ab91

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