Malicious PDF — malware analysis report

Static analysis result for SHA-256 c53f8092a2c1e295…

MALICIOUS

PDF

132.5 KB Created: 2021-03-30 09:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2c6f8bb452e3a937d6091d21a1626a0e SHA-1: c203e63514c9234146f44f54edfc187d2ca4bf70 SHA-256: c53f8092a2c1e2952fbaf7a668181cc961c1d77a7eca87dd24e169780d904bce
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of 'utm_term=ps4+emulator+software' in one URL indicates a lure for potentially desirable software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/123?utm_term=ps4+emulator+software PDF link annotation
    • http://puwobero.22web.org/best_bollywood_movies_song.pdfIn PDF document text
    • https://xisezuvu.weebly.com/uploads/1/3/4/0/134096300/7349138.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://sikenobavusemel.weebly.com/uploads/1/3/2/6/132682861/f189a95cf.pdfIn PDF document text
    • https://bopugokux.weebly.com/uploads/1/3/4/9/134901566/e50f9.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://bawikivogo.22web.org/m_b_b_s_ki_full_form.pdfIn PDF document text
    • https://sofifego.weebly.com/uploads/1/3/4/8/134899758/8951901.pdfIn PDF document text
    • https://fimupekegu.weebly.com/uploads/1/3/4/5/134502303/zugotaxivitilag-dakazogelutum.pdfIn PDF document text
    • http://winfreeiphone.xyz/how_to_thread_bobbin_brother_hc1850wgye9.pdfIn PDF document text
    • http://gatorama.fun/minn_kota_power_drive_v2_for_saleoxhwo.pdfIn PDF document text
    • http://lezigawojubitok.iblogger.org/12712047115.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://renowuvix.epizy.com/birthday_wallpaper_free_for_mobile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/447b5e0b-92aa-4e94-8ceb-1d8800128911/dark_lover_summary.pdfIn PDF document text
    • http://savikolapuxol.rf.gd/46398166299.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a02e70d1-3395-40cc-b0bb-580a4f47c1f9/favalid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a945356a-f377-4967-affa-a454e9c0ee4a/words_that_start_with_d_to_describe_someone_negatively.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c656d817-4c0d-4254-9a78-9d42cc1d4bdd/check_codes_on_2012_jeep_wrangler.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9b77cfc-aafc-4114-8091-14a85dde79cc/buwegaruvuzetotusukosop.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001989c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1989C 14436 bytes
SHA-256: 18581a8d1e68bb0fed93d6d62aece9a6908c6d6ff221a8ad7c3575288b12f0d8
font_01_sfnt_off0001c7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C7AC 5096 bytes
SHA-256: 3547ec1319dbec1a9f06a0e926a37bd72dcef98a8fcb0ae3743850ccc7c1fa80
font_02_sfnt_off0001d8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D8FA 13152 bytes
SHA-256: f6b84991c3ea23e4acae731cd7a03259c97ea9e545a90002faa1ee5676bdcae8

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