Malicious PDF — malware analysis report

Static analysis result for SHA-256 0737b4fdf726f14d…

MALICIOUS

PDF

96.3 KB Created: 2021-04-16 07:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 4de570f80c9e6320825b07a03ab018ca SHA-1: b85d8d35b4dfff310a0ac04ac8e776f635f1328b SHA-256: 0737b4fdf726f14d186e2d38a330db798d7babcaa3ae7bea18fa38d2500c36ad
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1105 Ingress Tool Transfer

This PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. The heuristic 'SE_PAYMENT_REDIRECT_LURE' suggests the content is designed to trick users into believing there are new or changed payment instructions, a common tactic in business email compromise attacks. The presence of embedded URLs and the ML classification strongly support a malicious intent, likely to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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 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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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://botokaw.ru/strik?utm_term=home+treatment+for+pimples+and+black+spots PDF link annotation
    • https://cdn.sqhk.co/punipopi/dRjaFig/2749204068.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412758/normal_6021f79c328cb.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/ihsieii/tezitowixuberutafarizozu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383308/normal_600fa1b011cb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386084/normal_606ab80db9605.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390643/normal_60137032a08ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501975/normal_60608a21deadc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/vifelifatedewopipoxiput.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bb40e48-59f8-4786-b8d0-c38875e07dee/88132819036.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6c77751-4cb3-44bb-8d0b-1008f2a2f2e9/interpreter_of_maladies_jhumpa_lahiri_review.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/icbc_report_a_claim.pdfIn PDF document text
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_516a3527316c47afbaf233e05b50f7dc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3e65515-f181-4d01-92ad-25a0b52185de/pathfinder_campaign_traits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceb08481-f54c-4ad2-8662-211c258f5f47/brother_se_270d_parts.pdfIn PDF document text
    • https://3c3713de-992c-4571-92b4-00afcb8cb2c1.filesusr.com/ugd/9dbdb2_2bd80a96b3844e59935591c2fa6ece72.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dagasopones/ejercicios_de_limites_indeterminados_0_0_resueltos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f1f477b-6a9d-41f6-87c7-0a888ab67c96/samsung_galaxy_s9_price_in_new_york.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20a730fc-c5d0-4f22-93d0-f4fbae32ed0d/artemis_fowl_series_book_order.pdfIn PDF document text
    • https://1ceef7f3-d523-4f80-a0a4-3aed54d3d17a.filesusr.com/ugd/48841a_ba4a39590bab4de9a8db0254fe819375.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/guxosa/football_manager_handheld_2013_psp_save_data.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6edec797-0d50-4bd8-b5f6-6b17026a142c/how_to_know_1_best_friend_on_snapchat_quickly.pdfIn PDF document text
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_fbabc411fdc2431fb4c6051c22870887.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_off000138f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F1 5464 bytes
SHA-256: 3be76b36dd75229a438f8229942898fcd78693b0b611e7218f4c0856e4ffc443
font_01_sfnt_off00014b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B69 11936 bytes
SHA-256: 938de59dba9eca74bd89b9965bd2f4cbf1ab6b7d71b898bf48fe38d9f8af296c

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