Malicious PDF — malware analysis report

Static analysis result for SHA-256 323603208e2685c9…

MALICIOUS

PDF

89.4 KB Created: 2021-03-16 06:44:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1457f97159a62a581b8c8fe0c068ccc4 SHA-1: b6530d78c0bc94f25e255afddc17bd1370b6686a SHA-256: 323603208e2685c9850756f7e902c3c8f9b1da92a54eac5f3bad003e7c1b4a31
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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://bologen.ru/award?keyword=truncus+arteriosus+types+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450630/normal_5ffda68278966.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413966/normal_6025960921db6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489042/normal_6022c8d874cc4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458833/normal_600818fed262d.pdfIn PDF document text
    • http://brumbum6.xyz/32953475479xqm9x.pdfIn PDF document text
    • http://finansi-7.online/libros_de_matematicas_universitariasqn41w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387577/normal_602a4cbb53cff.pdfIn PDF document text
    • http://starconflict-game.ru/500_poses_for_photographing_couplesoemw6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454821/normal_601a30484f1f6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/1f7aac6a-2223-4e1e-8948-7b5ec281dce1/difference_between_transformational_leadership_and_transactional_leadership.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/786ab82f-ee88-4470-84a7-b22071266563/nigidatolipuruvawax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ab53fd4-b2c8-45da-9df4-d3380f75006f/how_do_i_pair_my_afterglow_headset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1b9eb19-fbcf-494b-a5f0-ecac87ed536e/charla_de_seguridad_orden_y_limpieza_ppt.pdfIn PDF document text
    • https://520c840f-7702-4e28-87de-278da5b03b63.filesusr.com/ugd/e633b3_6726a81a1ef943179409fab5424e241e.pdf?index=trueIn PDF document text
    • https://878ee1be-828d-48b9-a24a-84283cf66a1c.filesusr.com/ugd/86936c_401bfc5cfd8744b6b9ba3d0d4ac10d81.pdf?index=trueIn PDF document text
    • https://297de083-771a-4730-a3b8-a2afe8c7d209.filesusr.com/ugd/47424f_f2cba9e4c60241ef883674827f4521f9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/148ddd8b-9283-49ff-84dd-b23023fd4c98/41438851840.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11356 5048 bytes
SHA-256: 0a2708ea3f340165803a01ffb0d19b85dd1b14d4d7594548cbcdff62e0591c96
font_01_sfnt_off00012493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12493 11212 bytes
SHA-256: 6e83c91be5cce0817a06f39f585699ef625947c5986c6b63da1fcf36ae3bf7bb
font_02_sfnt_off00014ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AB8 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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