Malicious PDF — malware analysis report

Static analysis result for SHA-256 c07d2eac0f13b987…

MALICIOUS

PDF

73.1 KB Created: 2021-04-27 08:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8d1b715e9c5a771afc2c0d4fc40d54d7 SHA-1: bb19a12464699dd1c84fa34c45f6a3673c0fd543 SHA-256: c07d2eac0f13b9873360a325d90d7aca6228a104e52184d2ee09c4102cb6130a
184 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, appears to relate to 'alarm systems troubleshooting', serving as a pretext to drive users to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=dsc+alarm+systems+troubleshooting In PDF document text
    • https://cdn.sqhk.co/lanuniwa/JhcmjdU/chemical_elements_listed_by_atomic_radius.pdfIn PDF document text
    • https://cdn.sqhk.co/kezavefizi/hcihcia/best_app_music_free.pdfIn PDF document text
    • http://wozoxudo.iblogger.org/zuwudifasamuliluw.pdfIn PDF document text
    • http://pidagenavuziw.mywebcommunity.org/thakur_prasad_calendar_september_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CtjdgtM/fast_money_halftime_report_cnbc_fix.pdfIn PDF document text
    • https://cdn.sqhk.co/zutijapuk/2Aljbgh/37734373457.pdfIn PDF document text
    • https://cdn.sqhk.co/gotakavapu/8nRFPA7/kpop_ranking_popularity_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/konidadelan/ifdsie8/chess_board_black_friday.pdfIn PDF document text
    • http://mekomob.getenjoyment.net/xajurupepikonasavo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_345e9c4199b247b494836554b6c913bf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/19dd0973-9ee3-4291-8b1e-75c6ab810458/other_words_for_mental_strength.pdfIn PDF document text
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_f51f6e4734854e64b2cc9f12a49f84f6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cf81519-d0ba-428f-8e47-942058130463/good_machine_learning_books_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5de7083-904b-45a5-9a72-3cd1ebe47ad4/what_is_good_bait_for_speckled_trout.pdfIn PDF document text
    • http://vugejepu.epizy.com/background_hd_picture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a869b34-4daa-4e82-9698-92821a10b359/55523875270.pdfIn PDF document text
    • https://104e0e48-a4c2-4a03-8647-06ef64d4e6ac.filesusr.com/ugd/e2c6c1_9f3f74c52d69451d8e9c68d6909b8021.pdf?index=trueIn PDF document text
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_e56b804c0c5147258c7e255b1e61fdc1.pdf?index=trueIn PDF document text
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_91ff02cbda0548c6b697b53679b33c14.pdf?index=trueIn PDF document text
    • http://devepovamijube.epizy.com/92990258268.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6075d84b-d658-4c7b-9e36-bd069a0ee0e9/does_tp_link_smart_plug_work_with_alexa.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_off0000e324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE324 5456 bytes
SHA-256: c2a43b45412bd6420c9e4ab61d976466e7a0a2e04d6fe0bb0cf6668429cf8110
font_01_sfnt_off0000f593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF593 9864 bytes
SHA-256: 28d1e6356f621bb4e6ce281e5ccbd94fc183c90d08b693cc7c46818ccc3fea52