Malicious PDF — malware analysis report

Static analysis result for SHA-256 f23dfc08754f1458…

MALICIOUS

PDF

81.8 KB Created: 2021-05-18 13:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 71d0e8a26d49c1490613e105fd1df68b SHA-1: c5e6a9721fabcfb5f6adaf1b3eba4cdc73cad283 SHA-256: f23dfc08754f14583e08068365a266516391db7964324673145fdbf2d911dfcc
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-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.
  • 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=trauma+bonding+psychology+definition PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369308/normal_601f0ac719f6f.pdfIn PDF document text
    • http://gesufumepemu.22web.org/herbalism_guide_dnd_5e.pdfIn PDF document text
    • https://xuwupeloz.weebly.com/uploads/1/3/4/7/134734270/kefas.pdfIn PDF document text
    • https://vidajubobulixi.weebly.com/uploads/1/3/4/6/134650234/3704b8b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384145/normal_5fe3e9b96f830.pdfIn PDF document text
    • https://putonikasobex.weebly.com/uploads/1/3/1/0/131070178/2ab7b7e5be99.pdfIn PDF document text
    • http://zinuvudoliku.iblogger.org/31873332186.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/are_schools_closed_on_veterans_day_in_florida.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/vilavepadegapaxupubivepa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9363b453-96cf-4ecd-9e77-0f77aab60f76/sigisafabipiduzed.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/how_often_to_change_civic_transmission_fluid.pdfIn PDF document text
    • http://fozabenisos.epizy.com/gusadagimaxisewaleramiwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1daca24b-bc3e-4cf2-98a1-32a2c6bcbc6b/asm_handbook_volume_9_metallography_and_microstructures_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/colonizing_america_crossword_puzzle_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/054a9417-e13a-4e12-91df-ac3db0282a65/lugagekavi.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_off000103a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A2 5760 bytes
SHA-256: 3a07de2c5f8ad2d114b72303bf2acc7eb34e3a81da1c95f3e40caded5631fd41
font_01_sfnt_off00011719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11719 10312 bytes
SHA-256: ca08a8d3e205b3e5040477a88d03d33de296a4a8383f9237aba7147f37c2bbb3

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