Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c537d38926d1f3…

MALICIOUS

PDF

80.1 KB Created: 2021-03-18 17:57:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 27849800a94ae1ff332ee12154b5d1c3 SHA-1: 5400a62c7c525e6dc78d191d77b7e1a950306e2e SHA-256: 77c537d38926d1f34d69cdc72ae95723af72251a560497c6a453093d77b1bfdc
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and likely phishing-related. It contains a large number of external links, many of which are SEO-optimized, suggesting a link farm or redirection scheme. The primary URL, 'https://jacksth.ru/wix?keyword=linear+regression+practice+worksheet+pdf', is presented as a document title, indicating a lure to trick users into clicking through to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • 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://jacksth.ru/wix?keyword=linear+regression+practice+worksheet+pdf PDF link annotation
    • http://santand-es.com/the_red_umbrella_chapter_8_summaryzmy0c.pdfIn PDF document text
    • http://dabosesavedevet.medianewsonline.com/aristelle_pille_packungsbeilage.pdfIn PDF document text
    • http://usene.xyz/86958664475zakvw.pdfIn PDF document text
    • http://jepisafidezegun.scienceontheweb.net/zebifetemisidikezapap.pdfIn PDF document text
    • http://xesapuwax.mywebcommunity.org/vugitogujas.pdfIn PDF document text
    • http://investmag.org/new_one_minute_manager_summary06frn.pdfIn PDF document text
    • http://teagreen.space/ligebufofozujarezupatusejy49v.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_f389ed00f379460dbd64c88360087f25.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/honda_shadow_vt1100_carburetor.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/contemplate_life.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/68484453441.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/aadhar_card_form_fill_up_online.pdfIn PDF document text
    • http://gubawakelu.onlinewebshop.net/health_behavior_theory_research_and_practice_jossey-bass_public_health_5th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/how_to_use_a_usb_sim_card_reader.pdfIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_24a4e4f9e4ab40abb1f146ec799b4ef5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/anexar_latex.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/tagadonozuluwunubeweb.pdfIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_9f6ee720b702408dadf2ee702635ccb6.pdf?index=trueIn PDF document text
    • http://lamupimifuban.onlinewebshop.net/59341929475.pdfIn PDF document text
    • http://romepasuv.myartsonline.com/union_budget_speech_2020_19.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/spring_boot_jdbctemplate_example_using_annotations.pdfIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_996665bf813f4a40ac9bce7f14972d6a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/astros_throwback_uniform.pdfIn PDF document text
    • https://3064a0a7-8496-4b95-be1e-56094aee372f.filesusr.com/ugd/0cf4b9_346163da7c914b5a9b6d39046998c7bf.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_off0000f403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF403 5480 bytes
SHA-256: f4b07649ef0d2d4898d602b373427df7ed29cd229407b5e91f8145f5aaa6e2e7
font_01_sfnt_off000106c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C0 12572 bytes
SHA-256: 6e4155735119ab0fb47a170f2732c9aa224f34abd2c69b758ed8c61b6f0d0048

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