Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f33fc13e1b91c07…

MALICIOUS

PDF

114.0 KB Created: 2021-05-14 02:40:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 23d58d31551b62123648bf81e27e2c84 SHA-1: 16a55bfb2d397c7f77d0aeee580e0b9339b29fbd SHA-256: 6f33fc13e1b91c07f47f17f914abb16d7e672a48e9127bdcd50502ff3fccbe0b
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://golowaki.ru/strik?utm_term=what+are+the+rules+of+billiards PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373520/normal_605866b383dce.pdfIn PDF document text
    • https://nufazuxumojo.weebly.com/uploads/1/3/2/8/132815750/9863967.pdfIn PDF document text
    • https://xixebume.weebly.com/uploads/1/3/0/9/130969831/xugovapib_fotojisikuli_wuwajabidadano_wagoro.pdfIn PDF document text
    • https://zubikazosiz.weebly.com/uploads/1/3/4/7/134761183/matepepapox_finulobov_gopizujutax_duximaj.pdfIn PDF document text
    • https://fuzuvetidodevik.weebly.com/uploads/1/3/4/6/134637128/1523324.pdfIn PDF document text
    • http://dewexipe.22web.org/sense_and_sensibility_characters_sparknotes.pdfIn PDF document text
    • https://kamilunumunubi.weebly.com/uploads/1/3/4/4/134486367/zokiriwofuvulikegidi.pdfIn PDF document text
    • https://wivujugojuz.weebly.com/uploads/1/3/4/8/134883460/winipezarobefatutema.pdfIn PDF document text
    • http://derilezin.sportsontheweb.net/71893521873.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380682/normal_6044931183212.pdfIn PDF document text
    • https://jupovibofekek.weebly.com/uploads/1/3/4/4/134490290/vodusuzitovuliz_vufuxe_dirufi_ruzisokakegawi.pdfIn PDF document text
    • https://vazemewezasal.weebly.com/uploads/1/3/0/7/130775722/ea315a2c523a8.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/gawabog/nisisisodugav.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/academic_calendar_2019_ssa_assam.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/23568911758.pdfIn PDF document text
    • http://zipulosi.atwebpages.com/stock_market_for_beginners_philippines.pdfIn PDF document text
    • http://biwosagamivi.myartsonline.com/onaroo_teach_me_time_clock_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/26214841540.pdfIn PDF document text
    • http://poxemibusap.epizy.com/dosawodixapal.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_off00018368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18368 5148 bytes
SHA-256: a265bb3d157e63c6e1782d43b9a2aeae26d3c06e2695db5a6b1aca6182c10c5c
font_01_sfnt_off000194e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194E9 11128 bytes
SHA-256: 9042d712ad215c516e5e0e9dff559798991e11b61898ad46107c6bb7a87224e8

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