Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ee870f5e576fc0…

MALICIOUS

PDF

81.8 KB Created: 2021-03-27 17:58:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 00cd64d88c437f7ae6c198bd50674722 SHA-1: 150e08917595d1251e0348a98ff73185bb8fe4d0 SHA-256: 53ee870f5e576fc0a467c249103d6c83629baa03a3b0dbe10aed8d668b506ba3
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it's part of a link farm or SEO spam operation. One prominent URL, https://xezojetit.ru/wix?keyword=good+luck+in+korean+writing, is directly embedded, likely serving as a lure for users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wix?keyword=good+luck+in+korean+writing PDF link annotation
    • https://cdn.sqhk.co/xurajalijok/RgggjaD/flower_vintage_wallpaper_for_iphone.pdfIn PDF document text
    • https://xavozunop.weebly.com/uploads/1/3/4/3/134305705/bosufirexafokev.pdfIn PDF document text
    • https://tidukefawa.weebly.com/uploads/1/3/4/8/134851120/e2e504b6ceb.pdfIn PDF document text
    • https://cdn.sqhk.co/xekemini/giCiehj/hockey_night_in_canada_apple_tv.pdfIn PDF document text
    • https://pobivizitonep.weebly.com/uploads/1/3/2/8/132815986/8597754.pdfIn PDF document text
    • https://cdn.sqhk.co/bisidilit/YjjghhL/43455273231.pdfIn PDF document text
    • https://cdn.sqhk.co/nasanoroge/eifM3XV/hardest_hangman_words_4_letters.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/kDmJ4Eu/themeforest_wordpress_one_page_template.pdfIn PDF document text
    • https://cdn.sqhk.co/lilodipu/ichijhL/nova_launcher_app_drawer_background_color.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/i6aJ6ii/57549208203.pdfIn PDF document text
    • https://cdn.sqhk.co/kolusugego/PiaBjhV/venus_fly_trap_actor_wkrp.pdfIn PDF document text
    • https://mixofugu.weebly.com/uploads/1/3/4/3/134351041/3159757.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzevunoxina/jiOhfZ1/joviduf.pdfIn PDF document text
    • https://cdn.sqhk.co/turovonunido/cjh4xFQ/free_printable_op_word_family_worksheets.pdfIn PDF document text
    • https://fezawajudew.weebly.com/uploads/1/3/4/8/134896424/pevefi_derupofusapo_tusenoli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_354f795232274c409ad15f934668c996.pdf?index=trueIn PDF document text
    • https://bdee3e82-1fe6-4084-b289-f15f5249f83e.filesusr.com/ugd/749937_efee058ef2c94f26ac6f984790dfdd6a.pdf?index=trueIn PDF document text
    • https://eaa62ee9-779c-4a2d-9f50-6c66b019a99c.filesusr.com/ugd/1cc777_96fd1695aa8c4089962a2936047e2ba0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a48a0d3e-97e0-4e3c-a523-3e802bcb2de1/kulositu.pdfIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_1a7287ff116d40a3a8bed7ebb169b10c.pdf?index=trueIn PDF document text
    • https://21319658-e817-4d6a-846f-872ccfe0f0c2.filesusr.com/ugd/982af2_c5adfa2a8a9f455aa528985c8b15db40.pdf?index=trueIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_698191fb2e0e474188c5a00b8d745c6a.pdf?index=trueIn PDF document text
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_8af2066f0bff4976866d2da35d8239ba.pdf?index=trueIn PDF document text
    • https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_9b4f8e8bb7404daab08e25cd4c9cffa2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2cd8aad-1efd-4177-aed7-7b3bf9a41c62/what_does_the_chariot_card_mean_in_a_love_reading.pdfIn PDF document text
    • https://569961a5-e6b5-462d-8b38-7193d5e7b20b.filesusr.com/ugd/a37a2e_1d8e78985a684f57a047de6a2560df02.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE555 8928 bytes
SHA-256: 1caa59e98aa5f37a4a16037328da349f814344972d4089be3125ac11d5ca9545
font_01_sfnt_off000101fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FC 5116 bytes
SHA-256: 7a6350efac6dae28c40c623af403b2025f99ff97046a878e5e6d2aaa035b0765
font_02_sfnt_off0001138d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138D 10948 bytes
SHA-256: 60bed51447fada5abb386bed8f413b60663f6bc49c539c7c04df269125601f96