Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a48724e832f232…

MALICIOUS

PDF

80.3 KB Created: 2021-04-05 17:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 23a9f433618ce51f4e6c220f7176383b SHA-1: b8a88d5a0e11f498de12626d7a5df54dc65a463d SHA-256: 81a48724e832f232d5504f0558ff6bd866fe8f9ffd2bd10d617a4f689522f148
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://fokemale.ru/strik?utm_term=hamilton+beach+brewstation+47900+vs+47950 PDF link annotation
    • https://cdn.sqhk.co/lebuzalezu/3jeiagd/vintage_collectible_costume_jewelry_marks.pdfIn PDF document text
    • https://cdn.sqhk.co/dikapagoloza/ejchdE2/duck_jokes_dirty.pdfIn PDF document text
    • https://votivugaxowo.weebly.com/uploads/1/3/1/1/131163932/dugenomuxeveposo.pdfIn PDF document text
    • https://cdn.sqhk.co/pakebisas/elmjjig/poughkeepsie_train_station_times.pdfIn PDF document text
    • http://re-prime.ru/how_to_pair_jam_hang_up_bluetooth_speakerjxkn0.pdfIn PDF document text
    • http://bumaga.bz/rubber_sheet_manufacturers_in_gujarat9odof.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/h94ueib/vozezasameje.pdfIn PDF document text
    • https://dejizova.weebly.com/uploads/1/3/3/9/133986792/zolimezo.pdfIn PDF document text
    • http://astrohelp.space/sapatilhas_de_cristal_wiki_drama_korsj3ky.pdfIn PDF document text
    • https://wuvozova.weebly.com/uploads/1/3/4/5/134500004/9338420.pdfIn PDF document text
    • https://cdn.sqhk.co/gotirawuz/Usgj6Fk/72948242765.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/time_to_file_answer_after_demurrer_california.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6338625-f524-4ddc-a7d2-6835cb33b570/loxotunojotigo.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/57778057339.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/oxford_guide_for_low_intensity_psychological_interventions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b1f4881-f56b-4906-99d8-94522f0a6945/32747920193.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe2353b8-4fcd-4c5a-8e8d-ed0ebd985a1b/dovapikixomosujoloru.pdfIn PDF document text
    • https://s3.amazonaws.com/neporezofov/wordpress_login_for_my_website.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcafdad3-ad57-4d3d-b104-afb03e5e7c49/95341168011.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/225f8cc7-9690-4868-8cd5-bb904bbd8762/how_to_adjust_bobbin_tension_on_brother_project_runway_sewing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23f0a313-a468-4b78-b82b-4d382ed6e048/62281594663.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_off0000fb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4C 5880 bytes
SHA-256: fc9ac2eb1f7bb56b8302d23be3864fb2eb92d73273f57dc0553ce69ebb866f55
font_01_sfnt_off00010f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4C 10748 bytes
SHA-256: 9e0aa44acf372cacdae5d3bf0395b570db23281864c4947e3d98a6c069613801

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