Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3ba9accc5f5e9b1…

MALICIOUS

PDF

76.7 KB Created: 2021-03-08 11:52:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3aed5d87de379f7ed42d73fddbdcc398 SHA-1: db9cc179b2846e431a1838b52cdd2108796878a9 SHA-256: f3ba9accc5f5e9b18627a4cabb1850ee06cb1e071ee035af1245fce4e2c77820
186 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 6

  • 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.
  • 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://druttle.ru/wix?keyword=little+tikes+jeep+bed+uk PDF link annotation
    • https://cdn.sqhk.co/gejixoneku/jfhh98t/extreme_bike_racing_game_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402936/normal_6044d9215681f.pdfIn PDF document text
    • https://cdn.sqhk.co/tusifefovozu/2jhRehc/acorns_invest_spare_change_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476941/normal_5fd1ed44adcae.pdfIn PDF document text
    • https://cdn.sqhk.co/resesexiraf/gijfbrR/one_gun_stickman_hack.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405654/normal_600ba044467e2.pdfIn PDF document text
    • http://vafakewa.iblogger.org/nizujoxukirixowawumatoxo.pdfIn PDF document text
    • https://cdn.sqhk.co/savaketiju/jggiigX/steel_pulse_true_democracy_blogspot_download.pdfIn PDF document text
    • https://cdn.sqhk.co/sokulutesi/sjgZZp0/stack_on_24_gun_safe_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448980/normal_5fec98071f4dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494136/normal_6038bfb849d5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445331/normal_604079742ef33.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2178e3ec-2e0a-46e0-af35-d8a6fdfeb21a.filesusr.com/ugd/c411cf_ad4e95e808d74c94a9f8210fa1d14e62.pdf?index=trueIn PDF document text
    • http://bibujilapewe.epizy.com/ikea_canada_catalogue_2020_request.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10aade19-3ddb-4653-865e-043bde21100b/16560213470.pdfIn PDF document text
    • https://37e0f79d-b0c1-4727-b76d-5b759c81288f.filesusr.com/ugd/9c66ff_21c8b623d59545f2a93f64969f1534bf.pdf?index=trueIn PDF document text
    • https://7835c217-6b95-46a1-915a-76cdebae3fe0.filesusr.com/ugd/debfb4_1c25a4e5af534dc999086f10d151fa78.pdf?index=trueIn PDF document text
    • https://a04ad255-06d6-4b17-97e7-91173d300295.filesusr.com/ugd/6864df_d8af0776be3a44c0ae2d73dd958493ad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3caa2b45-8169-4cb3-996a-98c5c4840a0e/nyx_cant_stop_wont_stop_concealer_color_match.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0534b56c-e77d-48eb-a72a-fbb8762c50bd/sum_of_interior_angles_of_quadrilaterals_worksheet.pdfIn PDF document text
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_2c1f6ec298ea4aa3b9e765b05f72a99e.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_off0000f139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF139 4868 bytes
SHA-256: b03de9ded721eeb62feae8b99f24296705642150e411ecea2578131a214779f1
font_01_sfnt_off000101db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DB 10476 bytes
SHA-256: 5ca85c583629ae059916338c5a55bf584b7c2466e1355a0b1a4cc55fe2ddd52a