Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e3892aaada35404…

MALICIOUS

PDF

152.7 KB Created: 2021-03-29 21:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 18a2a80f87f94d8d649ba7cefdc416f9 SHA-1: 64b69a3e6ac154976862a936ad0ec585e375cf18 SHA-256: 4e3892aaada354044e5078a21c5b36f79cdb1a3fa60b74d11fce65f63af41fad
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment designed to lead users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • 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://golowaki.ru/award?keyword=module+in+science+grade+9+answer+key+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478146/normal_600f40c0e1e75.pdfIn PDF document text
    • http://picply.ru/wexamorelrfsh3.pdfIn PDF document text
    • https://bonomomu.weebly.com/uploads/1/3/0/7/130775928/pusikabijo.pdfIn PDF document text
    • http://gratoraama.website/nilolueum0k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372696/normal_5fd27c132068b.pdfIn PDF document text
    • http://remastacer.com/mtg_card_maker_android52ixn.pdfIn PDF document text
    • http://santaparker.store/2015_cadillac_srx_performance_reviewc8z98.pdfIn PDF document text
    • http://myfavoritesun.xyz/tabla_conductividad_termica_w_m_c8o84g.pdfIn PDF document text
    • https://fikugutadopoxas.weebly.com/uploads/1/3/4/3/134340330/c93b3.pdfIn PDF document text
    • http://zatoboyvibor.fun/talent_manager_idle_music_clickers2nk9k.pdfIn PDF document text
    • http://prognoz-football.club/506889440327i3nl.pdfIn PDF document text
    • http://goods-amzon.com/android_avd_manager_not_opening4pnvh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c8844e7-d361-48a5-a1fb-6d247bc346d8/life_pharmacy_al_warqa_offers.pdfIn PDF document text
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_14989aa0b01847038ff65c53508e13fd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/17b6c6b3-ee62-4c30-87b2-123c42efb044/how_many_ounces_in_a_small_cup_of_dunkin_donuts_coffee.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62d8722e-beda-4130-9b0b-cc69daa90225/lasujawogijekuj.pdfIn PDF document text
    • https://8a7e94d2-1b07-4399-8a7b-cfebf1eb419e.filesusr.com/ugd/e78b77_e905761fe3c84974a80a8287a909cadf.pdf?index=trueIn PDF document text
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_52362aeae61a4fc1bb77b83fb539de97.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b427739-3cee-449b-96ae-a6217c57a9c4/cake_learn_english_app_download.pdfIn PDF document text
    • https://62abf401-5fc9-4991-ac00-cb6a0c8cf8ec.filesusr.com/ugd/e4ff69_5da6f81a19a74cf5a89e335db9d6dffb.pdf?index=trueIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_7ea224950d70412cac5cfde2e0588236.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_off00021946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21946 5740 bytes
SHA-256: 84301327bc11d5084b30cd904bcfc31ee1a02a4ab99f7066a5cdde0d4c2d1a01
font_01_sfnt_off00022d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22D0A 11568 bytes
SHA-256: 90fc1f93bbbbb0ebd69d8dd09070c8449c7cdf20bfee5b6db594fe4ff8f2646f

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