Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec2b3ac2e7515c8c…

MALICIOUS

PDF

91.3 KB Created: 2021-03-31 09:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d7d91b13296a668ffa7cb920e2b56d2d SHA-1: 1016beac708821e33e255a0bd9cb6d94d28d6a9d SHA-256: ec2b3ac2e7515c8cbbd9b9f83c34c2aa51c60d82eb6782f2fdde5e0d0f83e10a
156 Risk Score

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://nipisod.ru/strik?utm_term=the+tequila+worm PDF link annotation
    • https://sunozidugeb.weebly.com/uploads/1/3/4/4/134486191/jepezamuvakudud.pdfIn PDF document text
    • https://xafusotegemuwif.weebly.com/uploads/1/3/5/3/135304795/cd7d261.pdfIn PDF document text
    • http://gelchlen.fun/315865788231khnr.pdfIn PDF document text
    • https://jirozonuk.weebly.com/uploads/1/3/1/6/131606844/xubufox.pdfIn PDF document text
    • https://cdn.sqhk.co/kibutonap/l4ibids/jak_lost_frontier_ps2.pdfIn PDF document text
    • https://cdn.sqhk.co/jetekujob/djfejiQ/color_splash_wallpaper_1080p.pdfIn PDF document text
    • https://xoxigukot.weebly.com/uploads/1/3/4/8/134861038/depesewuwun.pdfIn PDF document text
    • http://itwomen.space/poulan_chainsaw_carb_diagram87ilw.pdfIn PDF document text
    • https://cdn.sqhk.co/vatukaso/bJ5gf4g/die_in_100_ways_apk_indir.pdfIn PDF document text
    • https://cdn.sqhk.co/lepudijazur/mEhhg5Q/bojow.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/livivuvuwugeb/pepitativixuxefapaku.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/verizon_fios_not_working_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/business_card_template_microsoft_word_2007.pdfIn PDF document text
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_bc15c9afa0be4af9a0c99c2587b6b1dd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xujitezu/learn_python_programming_the_hard_way.pdfIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_9905e59e09ce456da4e055bdb3b4b2e3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/cigarra_e_a_formiga_esopo.pdfIn PDF document text
    • https://0f7a2101-273c-4f7f-b1fd-079d1ad923c1.filesusr.com/ugd/a7ea6f_d18eae75153f4b27aabd2ef8ad98e8fc.pdf?index=trueIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_56f5484f8c9a4948b6685d2ee13c3514.pdf?index=trueIn 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_off00012758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12758 4912 bytes
SHA-256: 1a73b9f78d628ebf3b0ffa49415a0e0d4e13d2b148579d3dad86edcee9404867
font_01_sfnt_off000137f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F6 11532 bytes
SHA-256: 52b86c7c2ad0d8504e3bf8cc386b0ad654e4dde5bb05756f13a0efcda09e1103

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