Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ae10c035623fcc2…

MALICIOUS

PDF

77.9 KB Created: 2021-04-28 06:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e6dc132ef6d7da867ca26de5869ab53c SHA-1: 23dd15e88768a0d18790ce16bb8d4d937c5138c0 SHA-256: 3ae10c035623fcc2f690daffa4a4ee983cbd7cc33270ec863d05441e167307ac
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with several pointing to disposable hosting and potentially malicious domains, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to a book summary, which is a common tactic for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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/strik?utm_term=what+of+this+goldfish+would+you+wish+by+etgar+keret+summary PDF link annotation
    • http://uscreditinquiry.info/excel_vba_make_hidden_sheet_visible7ojc9.pdfIn PDF document text
    • http://perevod24-card2card.site/guess_the_creepypasta_free_for_all_20180imik.pdfIn PDF document text
    • https://cdn.sqhk.co/fubafonu/RpPljhZ/cut_it_out_meaning.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444357/normal_6047725ced3c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369166/normal_60644988b67e8.pdfIn PDF document text
    • http://freedate18.xyz/partnership_deed_in_gujarati_language98k7u.pdfIn PDF document text
    • http://skout.tech/geoffrey_hodson_books0vh1v.pdfIn PDF document text
    • http://visunuduxat.mypressonline.com/learn_russian_basics.pdfIn PDF document text
    • http://suvuxivenorum.mypressonline.com/sat_subject_test_answer_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/ganidabizi/ijjbjdt/hide_file_extensions_mac_terminal.pdfIn PDF document text
    • https://cdn.sqhk.co/sorubajuzoxe/06Fq7gw/collin_county_detention_officer_uniform.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367313/normal_5ffd6947b5646.pdfIn PDF document text
    • http://gemubanabugawa.mypressonline.com/wujuriseziwekonuzezisu.pdfIn PDF document text
    • http://surozofawowidom.scienceontheweb.net/39299551299.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/45b68ee7-fec7-4e4f-b62e-44c200ddf8cb/pudelivonuxiduvumegim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87dd9f7c-1d0c-4fdd-ba05-d48c1aec2b6f/nokix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22de8d24-b224-4ec0-88cc-ce70d05e7385/dd_ravenloft_campaign.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/932cc730-897d-4c90-9dea-4f5c2647c142/77410644692.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aecf2a3-67a9-467a-82bb-210b78e59b39/87037573546.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c2fb7bf-6367-4469-b3cc-736b837938d0/what_is_the_median_income_in_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16941d23-da8f-415f-89be-a3dfa9c174b4/human_trafficking_news_texas.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_off0000f27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27F 5732 bytes
SHA-256: d4fd66c223a13f3947a4969bde74fa0c5a3a6a0ff30ed83c6a4df24e4f734dfb
font_01_sfnt_off000105fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FC 10564 bytes
SHA-256: 7432e3f89dd479acb0849908ebb9041765463467970fb7194768399b1de26ad2

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