Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c54b1bae985583…

MALICIOUS

PDF

72.9 KB Created: 2021-04-01 21:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 18bacb623888a300d02568dbc7e3405b SHA-1: 2bd0e5401d7aaaf2521194e78ca4c3d2cf5cc8d8 SHA-256: 80c54b1bae985583b88a2b1e95d92ffb6fb35302934232f6e90506709abd050c
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier strongly indicate malicious content, likely phishing or a trojan delivery mechanism. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to exploit users via external links.

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://lozipotod.ru/award?keyword=background+drawing+pdf PDF link annotation
    • https://cdn.sqhk.co/pewowutefiw/jiLoaPd/74645151329.pdfIn PDF document text
    • http://jikusofare.mywebcommunity.org/carpentry_and_joinery_level_1_diploma_book.pdfIn PDF document text
    • https://nelabudojila.weebly.com/uploads/1/3/4/6/134666505/7148142.pdfIn PDF document text
    • http://ranupila.mywebcommunity.org/amiga_date_cuenta_libro_capitulo_2.pdfIn PDF document text
    • https://cdn.sqhk.co/jujejorule/6GggCo1/spain_football_team_wallpaper_hd.pdfIn PDF document text
    • https://cdn.sqhk.co/mofosalamo/GieDVGA/ruterisige.pdfIn PDF document text
    • http://wutanumijejol.sportsontheweb.net/on_green_dolphin_street_miles_davis.pdfIn PDF document text
    • https://zojajodasu.weebly.com/uploads/1/3/4/3/134354616/zajoxi.pdfIn PDF document text
    • https://cdn.sqhk.co/nopawuwam/TMr2jhi/45935614587.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_f9176fd04f58439d9dcd12ac4fdb6afb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wujapu/cset_english_subtest_iv_study_guide.pdfIn PDF document text
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_d847088b91194c8f8c228a96fabbf221.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lakadutof/forgotten_realms_dwarf_clan_names.pdfIn PDF document text
    • http://bifiwapaz.onlinewebshop.net/subarachnoid_hemorrhage_adalah.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/70649025087.pdfIn PDF document text
    • http://lafagelupuf.myartsonline.com/60970812717.pdfIn PDF document text
    • https://56c41596-c8b3-4aa7-a075-23c9724d7f97.filesusr.com/ugd/ed77b2_ce30913eed0b49f685fd3fc08b5d6a90.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/dakesor.pdfIn PDF document text
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_10cde8b21e5f4b88af6765f3de2ba843.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zedudo/arteriovenous_malformation_behind_eye.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_off0000e11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11B 5316 bytes
SHA-256: 6df83c0ac7e90b3fe4d1f7c663cda75b802f304dc44e9eee16cabd987d89c474
font_01_sfnt_off0000f35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35E 10260 bytes
SHA-256: 5702a210ef17447917de27fcec88380eebea41e96cc64a9f35df15bc907e2fe5

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