Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f866a6e3dad340f…

MALICIOUS

PDF

82.1 KB Created: 2021-02-12 04:02:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c3500a7446254116b4b2de0fc6890039 SHA-1: cc632454a56bc9841ccfedd0b0faf74a987f9b10 SHA-256: 4f866a6e3dad340f8eaeb1248c6f4cdc83287f481e906468d73b118cdf45a166
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several heuristics indicating they lead to malicious redirectors and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/wb?keyword=hebbal%20platform%20number%20in%20majestic In PDF document text
    • https://cdn.sqhk.co/wezufunin/Jhehijf/91370848564.pdfIn PDF document text
    • http://poopo.ru/android_8._1_os_for_pcex8xe.pdfIn PDF document text
    • http://legrand-spb.ru/23673235179qsfbv.pdfIn PDF document text
    • https://cdn.sqhk.co/bosamame/LgeJbhd/ea_sports_ufc_4_patch.pdfIn PDF document text
    • https://cdn.sqhk.co/busosuwik/ZOjidGm/mufiliref.pdfIn PDF document text
    • http://summerita.fun/624157426611kf8b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490252/normal_5fde042acbf51.pdfIn PDF document text
    • http://prodson.fun/tortoisehg_workbench_tutorialmtuaj.pdfIn PDF document text
    • https://cdn.sqhk.co/sojowidaz/IbjcjeO/wolf_simulator_unblocked_games_99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368740/normal_5ffe17a826f03.pdfIn PDF document text
    • http://winoraama.site/j_letter_images_in_heart_hdp09uh.pdfIn PDF document text
    • http://wirelessinfo.ru/bhigi_palko_pe_song_download92k30.pdfIn PDF document text
    • http://ueuniti.xyz/tutajoxamofonapoo0j.pdfIn PDF document text
    • https://cdn.sqhk.co/virurewev/dicUgiF/wheelie_bike_game_hacked.pdfIn PDF document text
    • http://rukozhop-guide.com/canon_dc_comics_meaning66bas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jusagi/greetings_in_french_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/duplicator_plugin_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/4636526489.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_off0000f42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42A 5220 bytes
SHA-256: 88507d4a8abbfc22dc3f9bb19f5e901b9129d0df5f0a4bace3142466ab97565d
font_01_sfnt_off000105c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C9 11088 bytes
SHA-256: f015ad1c15292626d395ab1966bf061e6480f9c927152360112580302db3b372
font_02_sfnt_off00012adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADC 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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