Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b96d528a34734d…

MALICIOUS

PDF

78.9 KB Created: 2021-03-09 20:13:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9f54cd9f54289349592a3239a4881ac7 SHA-1: 9ece7e2f17a295c25758f799e437399e08660b4c SHA-256: 90b96d528a34734d30dd088034b6d115f3e53eecafabcfc66cfb19fd111a1861
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://golowaki.ru/123?utm_term=runescape+bloodweed+guide PDF link annotation
    • https://cdn.sqhk.co/fiseguvugele/fI3ibhh/woodturning_face_shield_recommendations.pdfIn PDF document text
    • http://wufamega.scienceontheweb.net/rerege.pdfIn PDF document text
    • http://nepatokada.mypressonline.com/56141277459.pdfIn PDF document text
    • http://torixewiser.medianewsonline.com/biggest_steal_on_golden_balls.pdfIn PDF document text
    • http://rejorevubirobu.sportsontheweb.net/tricks_to_solve_aptitude_questions_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380380/normal_5fca41d3f1975.pdfIn PDF document text
    • http://vimobewawulipiz.mypressonline.com/nudegateganasak.pdfIn PDF document text
    • http://gewututikame.getenjoyment.net/55225254822.pdfIn PDF document text
    • https://cdn.sqhk.co/zisubiziwu/cXiAWhi/suguweposowan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450719/normal_6043969a46baa.pdfIn PDF document text
    • https://cdn.sqhk.co/kipaselofuza/heZgi9M/89258098639.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369487/normal_602107a203b14.pdfIn PDF document text
    • http://duwinijuj.mypressonline.com/jaxulozixojanugisi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gagolabirej.atwebpages.com/formulaire_regroupement_familial_espagne.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cae44e2-1945-4b5f-8e73-5ac4f62a0dbd/dopijijokajam.pdfIn PDF document text
    • http://pimobepetokonud.myartsonline.com/catia_v5_free_download_for_windows_xp_32_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a66f56c1-70d9-4965-859a-5f6f3f71a87e/66104313696.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96fca1e9-6e59-42fd-8054-1128633ce34d/what_is_the_stanza_structure_of_a_poem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41ad7ed9-7a39-43c5-abf1-0d39a4d311e5/the_antichrist_nietzsche_epub.pdfIn PDF document text
    • http://ligoroxenafof.atwebpages.com/chick-fil-a_nutrition.pdfIn PDF document text
    • http://gogujigasad.onlinewebshop.net/vuzatajelovojaxage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bf78169-d9f9-4098-851d-a1415ae9b29b/mezebofagewevitovof.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_off0000ed16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED16 5384 bytes
SHA-256: 7cbc9306330452e952670ca2ba684411988fd4010f58c1f2e4b9ccacb5e0cd57
font_01_sfnt_off0000ff8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8F 14940 bytes
SHA-256: 681594125b0f1cc10eebc88aab81dbd0e82f5b362f2d0e091a64fb39e342efcd

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