Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd17fba76402ab22…

MALICIOUS

PDF

86.2 KB Created: 2021-04-25 11:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 52ef13a523ca5bfb928280de48fcac5b SHA-1: 106049ae486b6731d78ab2ca568f7703a845ee06 SHA-256: cd17fba76402ab2231e3dbb4a29ff925ba39fe53e38c164fa58df6746f31355d
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/strik?utm_term=bafx+obd2+best+app PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427079/normal_6033a29af26da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414688/normal_5fc7d43f221a8.pdfIn PDF document text
    • http://xazezojalaz.22web.org/define_international_relations.pdfIn PDF document text
    • http://kubevevof.iblogger.org/98779989970.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456663/normal_600e05be51926.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mujotipaxoxi.epizy.com/adobe_after_effects_cs6_32_bit.pdfIn PDF document text
    • http://pitudug.epizy.com/bemidib.pdfIn PDF document text
    • https://36071b1a-d853-4ad1-bccf-0ed894d94038.filesusr.com/ugd/906e9f_892b824a9fba4bad939199b266991441.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a3a5cdf-c9cc-44ba-8800-04a836ff2866/matlab_subplot_position_units.pdfIn PDF document text
    • http://dinedolorexos.rf.gd/pupejunikivuvub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b5b179c-526d-4a67-bcb5-6d156dd4263e/romatefapiminofetox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01373236-72e6-4e96-a6b1-b96a391e09a4/30900021001.pdfIn PDF document text
    • https://47e244ab-6b1f-4ae7-97e8-86de5b619f9f.filesusr.com/ugd/e1d12c_bb2bdf27c3e64c9e9aa446bd998f8eb1.pdf?index=trueIn PDF document text
    • http://xonatude.epizy.com/html5_canvas_tutorial_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97555e58-ca22-4d0c-a64c-c7c6a7cd5f77/all_about_stock_market_quora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fd801a6-e8b4-4dea-9b48-ffae5785b17a/19226669739.pdfIn PDF document text
    • http://gobewodekopatu.epizy.com/grade_12_physical_science_textbook_free_download.pdfIn PDF document text
    • http://gafigap.epizy.com/7229219781.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_off0001130d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130D 5296 bytes
SHA-256: d95c4927752885b6887fab154068c75c4f11d5e9a45fc95afa7d96a1989529c5
font_01_sfnt_off0001252e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252E 11620 bytes
SHA-256: 2b5f8e6deb56467de8bcb53a0361501a12114542fea9053ba98702d69e26ba21

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