Malicious PDF — malware analysis report

Static analysis result for SHA-256 49e8824eb928e287…

MALICIOUS

PDF

76.3 KB Created: 2021-03-09 11:46:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 589bd6a0043984c93feea1eaaa790b7e SHA-1: 6293ff0589dccffb50154dd29ec636ccf4ba9fc6 SHA-256: 49e8824eb928e28747debba565606678f4d7c6949f505cbe9da55395c3fdff00
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded URLs and the overall structure point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://resalured.ru/123?utm_term=catherine+wheel+ferment PDF link annotation
    • http://kipededevidabun.iblogger.org/how_to_assemble_cuisinart_smartpower_blender.pdfIn PDF document text
    • http://habercigo.com/small_business_loans_for_veterans_in_texasu6ck1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444850/normal_6008af3dda6af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402519/normal_5fdd669f3d24e.pdfIn PDF document text
    • http://nudistoff.club/business_management_chapter_17_quizletekbal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472198/normal_600ea92362ed0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501367/normal_5fe0b8140cc38.pdfIn PDF document text
    • http://fsbsiod.com/jefefobawisusinifp6fji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454179/normal_5fd306cadc0cf.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://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_b855c3f2d5c54a71baebecc57af3a4d3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6178e215-bd48-44cc-93f5-df95ba9fe25f/the_house_with_a_clock_in_its_walls_movie_review.pdfIn PDF document text
    • https://0f285ee0-1b14-49a2-8a3e-060a2db94812.filesusr.com/ugd/4bf67f_cbdd8bf12b384efdbd446ff6feccda36.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c49047e5-a8a9-4b53-a584-1a55c67c88e7/jafaradadagegal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/447d7224-860a-4578-8b9d-28ff490288ad/oster_6_cup_rice_cooker_recipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3c4f073-8ac4-438c-805d-e15a3973401a/hp_model_11_y010wm_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/828385da-8576-4510-9996-836417d0ef09/does_your_face_get_flushed_in_early_pregnancy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50fe275b-b68d-46c9-a758-01cfbb4ba2ce/how_to_write_an_essay_for_high_school_application.pdfIn PDF document text
    • http://mekidojakad.rf.gd/kupuxexegoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d04e8e30-cda0-4d26-9694-f2482d6feb15/24684788177.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3334d1be-03d7-46bc-861e-b330dc6dc2b8/37407563333.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44010717-987c-4831-bbf1-3f045e7c52b0/wibobujopulo.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_off0000e2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B9 4624 bytes
SHA-256: 3bb9fbd61e623ced946d1da0a70866b6e97de3cba182388746bdc78a102acf20
font_01_sfnt_off0000f241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF241 10400 bytes
SHA-256: efd710478e9e8ab9d60b2cb51d8a72e5949bff942eba766ea9ca9fff003eab86
font_02_sfnt_off000115b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B4 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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