Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4934884b0dd9531…

MALICIOUS

PDF

70.1 KB Created: 2021-06-01 07:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 70a4f3b3d2c49e11614a323f1335b1f4 SHA-1: b991e8b6ab9c428c933bd119d51680ce78632457 SHA-256: f4934884b0dd9531bd077abebb3d349eaf6473c71fe03f37eb11526f4067d26e
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 0.9998

Heuristics 5

  • 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 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/123?utm_term=gerund+grammar+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422133/normal_60371a05286a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474752/normal_5feb75df64acd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391013/normal_5fe4d4a2ce932.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_6044694bbffb0.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4374951/normal_60b39b80b2554.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496153/normal_604340a564074.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475987/normal_605005ad62059.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://siwuromo.pbworks.com/w/file/fetch/144425184/65874951734.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/755ceb0f-0aad-4766-90f6-90f21b4ed1df/26781160407.pdfIn PDF document text
    • http://bojirakaj.pbworks.com/w/file/fetch/144424923/62679468198.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09221752-5953-4107-86f0-268295fbc2a5/jovajowegamaxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d3a98a1-58c6-46fd-82a7-07a95ed15ad9/55065601787.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/414f7858-840e-4bf6-a25b-4fd3d0dc644c/what_are_the_ranks_in_starcraft_2.pdfIn PDF document text
    • http://bupataved.pbworks.com/w/file/fetch/144428904/nailed_it_application_process.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5bc293d-c80a-44e8-afa1-9043a98cbb0b/how_do_you_find_the_z_score_on_a_ti_84_calculator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae43be06-455c-4fbf-92c1-3f0a3b87ea1f/why_is_my_dell_xps_not_charging.pdfIn PDF document text
    • http://kelivesas.pbworks.com/f/what_are_some_biotic_and_abiotic_factors_in_the_tropical_rainforest.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_off0000d657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD657 5392 bytes
SHA-256: 5208dd6abfd1133db9ae63e92bf02d1ffbf91eb9ea9a01d9f5300f688b93cd9e
font_01_sfnt_off0000e89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89A 10196 bytes
SHA-256: 9268f83a84d82811b19ee7ccf724625f852ae6f07d28ba2f4dd7c708ff2e0dd8

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