Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f14cbd8e3d328c…

MALICIOUS

PDF

79.5 KB Created: 2021-05-20 00:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fce1780c57b17ac2bb859a005fdb37c6 SHA-1: d790ee393d4ae969d2f82e6c86cad535c2cac1fc SHA-256: 15f14cbd8e3d328c9d945d08134f6832205e08b94282ab043364f07b2a2b9ab9
156 Risk Score

Malware Insights

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

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 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://jumiwimov.ru/strik?utm_term=oxido+de+cromo+4+formula+quimica PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427498/normal_6041b684ba1db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408352/normal_5fc6a9fe0fe79.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402262/normal_5ffb9fd0b34ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393034/normal_5fdcc6f6ef5d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385412/normal_603a3e6d57b8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388422/normal_6035362ee8f73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469370/normal_605a5565169ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482403/normal_6061f1ee94a52.pdfIn PDF document text
    • https://nosovaranipad.weebly.com/uploads/1/3/4/7/134743093/tobikojasuj_dejibarovuj_pamakuvuk_falivuvuvex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495254/normal_6055ee5564973.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470405/normal_5fc979f3199ac.pdfIn PDF document text
    • https://rexekimat.weebly.com/uploads/1/3/4/0/134017736/921c742b.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/1372a8ce-fe35-4f7f-b34b-c21e362c56a2/2003_jeep_liberty_fuse_box_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55540533-c034-4405-bd04-52ffab8cf4b9/thinking_recursively_with_java.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/942ce9ae-6082-486c-a2eb-670050d25642/where_to_buy_gift_wrapping_ribbons.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a0600f9-4877-4ae8-9671-1748ba0b2133/lupuvaranokewixopefawowit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21d429f0-00a3-40d1-89a1-38335d7a276d/how_to_reset_a_first_alert_smoke_and_carbon_monoxide_alarm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a980c70c-2454-435a-bd32-f7152d3c77e9/a_series_of_unfortunate_events_book_5_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fbfa413-8005-4127-9709-d2281868c939/business_analyst_course_online_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/587e05ca-a5af-4bf3-8b76-da6ff8671948/dikaxanexo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09294857-2f08-4086-ae8f-e2924f92d18b/how_to_change_the_time_on_a_keurig_coffee_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c32ae23-2f7e-4273-8269-861d8d75116b/99633074339.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_off0000f373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF373 5300 bytes
SHA-256: 028317cd1b021f33a3e202a7cdd142c4a3e005e71618c573bc65e41307f435be
font_01_sfnt_off0001056f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056F 13912 bytes
SHA-256: 8b615566aee0c320fb0bb4f0e45b10670d5f363cb42ff4a104d364dc746fcf9c