Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ebd9b58e769b44a…

MALICIOUS

PDF

77.7 KB Created: 2021-03-28 19:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 72d0fe216c5fa9fe4791de602722c775 SHA-1: b614a2d93186ef877cd9ee4025e82ecd141877e7 SHA-256: 7ebd9b58e769b44ac484b6439208703621a104c4e3eb9e0e508501ef32ea7e69
246 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to disposable hosting and appear to be part of a link farm. One critical heuristic identified this as a brand-impersonation credential phishing lure, specifically mentioning 'target' and an action link to an abused redirector. ClamAV also detected it as Pdf.Phishing.Trojan. The embedded URLs and the nature of the heuristics strongly suggest a phishing attack, likely using the PDF as an attachment in a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://katozela.weebly.com/uploads/1/3/0/8/130874493/zetamuxilibalezoga.pdf.
  • 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://vilenefex.ru/award?keyword=multiplying+binary+numbers+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366017/normal_6054fd04f0c40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409258/normal_6026dac9a1bea.pdfIn PDF document text
    • https://katozela.weebly.com/uploads/1/3/0/8/130874493/zetamuxilibalezoga.pdfIn PDF document text
    • https://ranatugirebulox.weebly.com/uploads/1/3/4/0/134017659/maroso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446645/normal_5fccb8d626fc5.pdfIn PDF document text
    • https://nalivugubogepa.weebly.com/uploads/1/3/0/9/130969323/nafupizukatekotudimu.pdfIn PDF document text
    • https://diveziriluro.weebly.com/uploads/1/3/4/4/134447321/6faa8becf8dcd8.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/6f3bc47a-dbfb-4468-9739-c40cd4ec0b30/wunusudipuruf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f94ab32-4633-469a-9caf-24ae298e9f92/maytag_bravos_xl_dryer_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82aaff1f-3783-499f-a626-c3d32092b080/purple_cow_ice_cream_store.pdfIn PDF document text
    • https://e6b56e3c-1b88-4cfb-972d-ab1702b0a06e.filesusr.com/ugd/8c0e65_a94e8d138bf5470bbfe7457c68f6d2ad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a17a0c71-65dc-453d-a529-c68a9159bbab/vetupotilawumo.pdfIn PDF document text
    • http://kiwixapuwijoj.rf.gd/possessivartikel_im_nominativ.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/parents_guide_crouching_tiger_hidden_dragon.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/is_a_drink_package_on_royal_caribbean_worth_it.pdfIn PDF document text
    • http://voxotili.epizy.com/weather_report_chula_vista_california.pdfIn PDF document text
    • http://xoxuvenopojox.rf.gd/writing_academic_essay_guideline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d9c0a95-4383-4692-a483-137c4108d9a4/8.1_perpendicular_bisectors_of_triangles_worksheet_answers.pdfIn PDF document text
    • https://3c45aaf8-24f3-4cde-9773-cf44a0a970d3.filesusr.com/ugd/ae7d54_15d0348250bf402eb006ba04dc047621.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fazujo/beginner_tai_chi_moves.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_off0000f108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF108 5608 bytes
SHA-256: 9db34f1240811fd501c06d10584e5fd73d0c60b306d9958b5a7757e35d06af05
font_01_sfnt_off0001041c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041C 10848 bytes
SHA-256: 874cc5f961bdb2f87001b5d3bfab4d5a95086cb868b093500b5dc536a307bbd2

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