Malicious PDF — malware analysis report

Static analysis result for SHA-256 741b6553d6b55c9e…

MALICIOUS

PDF

76.0 KB Created: 2021-04-23 22:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3a70239b97a9fed1c19af8606e9dca16 SHA-1: 6a471474a1f4b62c85dae7554be6442c99224947 SHA-256: 741b6553d6b55c9ef9f04edb3a8b0b7edf3dac133cd513fde17c823a97b23e30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are to other PDFs, suggesting a link farm for SEO manipulation. One of the primary URLs, https://xezojetit.ru/strik?utm_term=top+notch+fundamentals+b, is flagged as malicious. The ClamAV detection and ML classifier also indicate maliciousness, specifically classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xezojetit.ru/strik?utm_term=top+notch+fundamentals+b PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4498345/normal_60530e2fb552d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369774/normal_5ff9c0235eae8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450158/normal_5fdff6483db16.pdfIn PDF document text
    • http://popegajinetulez.iblogger.org/letter_from_birmingham_jail_color_coded.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401519/normal_606a04a9e651a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415519/normal_605eef7fec9fd.pdfIn PDF document text
    • http://zotokes.iblogger.org/jokesavuperanidoga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414488/normal_5fd34e3043e69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416512/normal_6026e0b7e2169.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369313/normal_600666c1b1716.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415950/normal_606a54a165960.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/kegovev/how_much_is_thanksgiving_dinner_at_bob_evans.pdfIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/duxoxexinojemuvat.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/fifty_shades_of_grey_movie_list.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/html_website_templates_dreamweaver_free.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/56930282482.pdfIn PDF document text
    • http://kowifojabar.rf.gd/xewelalude.pdfIn PDF document text
    • https://95fbbc11-640f-4658-acdf-6e09da746871.filesusr.com/ugd/e42ee3_9b00ef8d6b4b40d6bb19521f1ddf0779.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/top_movies_website_name.pdfIn PDF document text
    • http://sonisan.epizy.com/toshiba_lcd_tv_service_menu.pdfIn PDF document text
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_0487b48f24f44d0282b2f43ac9156df3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/resixexi/xorimesomudosukupeji.pdfIn PDF document text
    • http://zuwodiruvukima.epizy.com/a_kiss_vocabulary_effortless_english.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_off0000e847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE847 5388 bytes
SHA-256: c9c78f346d7509e68f8cc219472f73ffdc918643fa0b6ddc9303be450d0d730f
font_01_sfnt_off0000fa73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA73 11596 bytes
SHA-256: 3e2c9bcd7fc9954dbc2d6419095bfb30e878236cb85f3d5b211984e10d5605ed

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