Malicious PDF — malware analysis report

Static analysis result for SHA-256 1060ef2c343a27c3…

MALICIOUS

PDF

75.0 KB Created: 2021-04-01 20:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1393d9f6c8e91c1b5285bdbcc5ec1905 SHA-1: 5cd96735506bcc87d21fd5ad55043eb7409b5469 SHA-256: 1060ef2c343a27c3e6d6602f4d72c11e0462f0d36dc91003ac89bc2dcbce4bf5
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including ML classifiers and ClamAV, as malicious. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting it's used to redirect users to phishing or malware hosting sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a link farm on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/award?keyword=calendario+laboral+2020+castilla+y+leon+pdf PDF link annotation
    • http://wumorumomu.22web.org/zijavemitiruguzu.pdfIn PDF document text
    • https://cdn.sqhk.co/bagadogod/MhfWibD/revenutufesivowekowuzo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425229/normal_6057a9f9d1ba5.pdfIn PDF document text
    • http://momexatajuma.22web.org/i_deserve_better_than_you_meaning_in_hindi.pdfIn PDF document text
    • https://cdn.sqhk.co/pogezasamu/dyH0yI7/horizon_nj_health_customer_service.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369318/normal_5ffa4d362127f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496571/normal_60359c88d83db.pdfIn PDF document text
    • https://cdn.sqhk.co/vifejoneses/dihYjgZ/epic_seven_stove_patch_notes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490720/normal_6004165f9d921.pdfIn PDF document text
    • https://cdn.sqhk.co/kiribikiv/JrheuZH/kobonufutufagivavod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493569/normal_60192e6a4e8d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447903/normal_5ffa0a9380c77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456379/normal_5fda984742738.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/88f89e51-cfce-42c7-b609-8d14551d6a87/67334640766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f7894ef-8a44-4e11-a52d-5c7e4ba8b67b/6227760022.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b890a65-6481-4537-8acb-f9d87af03974/astrology_world_predictions_2021.pdfIn PDF document text
    • http://purevaxa.epizy.com/segmentation_techniques_in_image_processing.pdfIn PDF document text
    • http://gobupisimas.rf.gd/x_core_sprinkler_system_not_working.pdfIn PDF document text
    • http://mizozibobekujul.rf.gd/65296876135.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfd87adc-b9bb-461a-aafa-8cd3dd91ad9d/rosemarys_baby_streaming_free.pdfIn PDF document text
    • http://woposatet.epizy.com/rileroruvog.pdfIn PDF document text
    • http://xupubuxasaf.epizy.com/45425521400.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_off0000e57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57D 5568 bytes
SHA-256: ec39d5da74577954ff5635ea6cf36cff213bc9214092d7692d361541ac74063f
font_01_sfnt_off0000f87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87D 11172 bytes
SHA-256: debfdb911b75d0f52610c04960c793e0427d6171150bb172b89bdc71efc9919a

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