Malicious PDF — malware analysis report

Static analysis result for SHA-256 1361d5708ae83cab…

MALICIOUS

PDF

72.0 KB Created: 2021-03-30 17:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98f9205aeed607a7870b5deffba99d4c SHA-1: 48ebefc48f17ba16d184094803755f60930fa73c SHA-256: 1361d5708ae83cabeba3ee52c104c6da3fa928fc57bf40804221cc5804552ad2
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which are generated to appear as search results for various PDF documents, suggesting a link farm or phishing operation. The primary external URI points to a URL that mimics a search result for "calculus 10e pdf", likely a lure to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/award?keyword=calculus+10e+pdf
    • https://cdn.sqhk.co/libodinidep/ghEkjek/amazon_board_games_for_6_year_olds.pdf
    • https://cdn.sqhk.co/fexejikexew/jaGjifp/28788551730.pdf
    • https://cdn.sqhk.co/jokawefezo/iiEicgd/shatter_glass_with_voice.pdf
    • https://static.s123-cdn-static.com/uploads/4424349/normal_5ffe74a373208.pdf
    • https://static.s123-cdn-static.com/uploads/4500438/normal_5fccc44cd6a76.pdf
    • https://cdn-cms.f-static.net/uploads/4373008/normal_6035c6f032320.pdf
    • https://cdn-cms.f-static.net/uploads/4473415/normal_5fd3cd31a25fb.pdf
    • https://cdn.sqhk.co/bupitagalir/ShbHI87/closest_nail_salon_near_me_now.pdf
    • https://cdn.sqhk.co/jigotove/WQfidgi/27462239815.pdf
    • https://cdn-cms.f-static.net/uploads/4475863/normal_603b625245bf6.pdf
    • https://cdn-cms.f-static.net/uploads/4465538/normal_601b8cbd7dcb4.pdf
    • https://cdn.sqhk.co/tisewesir/g1AiagX/call_of_duty_warzone_apk_softonic.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tarizirefevifab/borland_c_4._5_compiler_free.pdf
    • https://s3.amazonaws.com/dofufiri/fezedoluxejalokib.pdf
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_1ec6f796163948fe943d7ef3792b24bb.pdf?index=true
    • https://s3.amazonaws.com/gadumagabusodel/new_car_racing_games_2019.pdf
    • https://6525eaf8-9a42-4119-9fb4-c3d475b3b78e.filesusr.com/ugd/80bfa9_91141d2b23f84b00bf7d4938efc226c9.pdf?index=true
    • https://s3.amazonaws.com/panokojol/8309359890.pdf
    • https://s3.amazonaws.com/wenobagupexekap/analogous_color_scheme_worksheet.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d882.bin
f5389b566c7dde5b0f0b162cd8dfa1e073d4ecaa87d273c45e9807f9a7ad626d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD882 5152 bytes
font_01_sfnt_off0000ea1f.bin
5785e99a75133c868905afb2d996775316549e6f7ebf0305140bee6a8fc31946		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1F 11480 bytes

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