Malicious PDF — malware analysis report

Static analysis result for SHA-256 549f435b629e5847…

MALICIOUS

PDF

85.4 KB Created: 2021-03-28 20:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 726d04484dd7d01e410fd0ce749d7702 SHA-1: b0cb96065bc36be6de663263841a975fa1564836 SHA-256: 549f435b629e5847803c4c488f066b0845e307359f59d28d867861f09802607a
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs that point to known malicious redirectors and disposable hosting sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a common phishing lure, likely attempting to trick users into downloading further malicious content or submitting credentials.

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://yafferge.ru/award?keyword=calvinismo+x+arminianismo+pdf In PDF document text
    • http://legiontry.online/55815758788r082b.pdfIn PDF document text
    • https://cdn.sqhk.co/surodamiz/qhbgghi/dazokep.pdfIn PDF document text
    • http://plsale.pro/wazumbwcm4.pdfIn PDF document text
    • https://cdn.sqhk.co/xoripudesew/dC9Hygi/online_chess_for_android.pdfIn PDF document text
    • http://crawlmqyu.space/to_have_or_to_be_erich_frommvvv9f.pdfIn PDF document text
    • http://medicalpracticementor.com/literary_translation_a_practical_guidergwbo.pdfIn PDF document text
    • http://rezltml.xyz/731238651219v49o.pdfIn PDF document text
    • http://bu-markett.com/3291758663cyvtj.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/qCyRcJP/fdic_call_report_glossary.pdfIn PDF document text
    • http://unityfree.xyz/babys_dream_serenity_criblr7ta.pdfIn PDF document text
    • http://makeyourself.xyz/toshiba_satellite_l755_drivers_for_windows_72rrbg.pdfIn PDF document text
    • http://cetakchantek.com/how_to_put_alexa_into_bluetooth_pairing_modeelt6a.pdfIn PDF document text
    • http://trysalon.xyz/tilujaririsuvfl1k3.pdfIn PDF document text
    • https://cdn.sqhk.co/tufuboloruj/yiiCggO/live_band_music_in_ghana.pdfIn PDF document text
    • https://cdn.sqhk.co/pajugeluj/jethfiL/78730963326.pdfIn PDF document text
    • http://nupubidodeje.22web.org/god_cut_songs_masstamilan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_20896e186ec74f31a70de8600f017c1a.pdf?index=trueIn PDF document text
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_9d56e29e42e1437696d59305f6c4d14a.pdf?index=trueIn PDF document text
    • https://0f0532cb-4478-41f9-91a1-cf277c4732ec.filesusr.com/ugd/8acad3_99f4e3dcda974f0a81f15d481e24d8f0.pdf?index=trueIn PDF document text
    • https://4a5660cc-52a2-48ff-9acb-4b4f1704cb6e.filesusr.com/ugd/81868d_8cfa9145fb2a408d8a7659fa1db08902.pdf?index=trueIn PDF document text
    • http://vujulazi.epizy.com/probability_sampling_methods.pdfIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_61fa5f386ffe46e18dee47473d653064.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBD 5220 bytes
SHA-256: 1a66ac7e92fa13f56ce020141085eb009d7f8b7b254fe61c260dc3b4c9281c95
font_01_sfnt_off00012171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12171 11408 bytes
SHA-256: fdae07ee8ddf021249ae68a32c301beb64a6774a9502035efc1d2c1086e223cf

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