Malicious PDF — malware analysis report

Static analysis result for SHA-256 f09084838a982fc4…

MALICIOUS

PDF

75.2 KB Created: 2021-03-08 04:26:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8cdbb60cfec5b1bcd4a6a4d51199b330 SHA-1: 940e94129457df4c2e1fe41d44a2c306db3a25f8 SHA-256: f09084838a982fc4e39c16a21bc4d37bf1c4563379e285ab82e3ec1ed5e32971
134 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/strik?utm_term=problemas+en+paraiso+chapter+8+summary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425919/normal_6026e1a5c31b1.pdfIn PDF document text
    • http://waliwosodumobu.iblogger.org/bluestacks_android_emulator_for_pc_windows_10.pdfIn PDF document text
    • http://front-glass.website/684516518127q857.pdfIn PDF document text
    • http://helper-badges.com/tasifatufu02b9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462993/normal_5fdaf03dd6b18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458838/normal_602d033e927fe.pdfIn PDF document text
    • http://doucheapp.xyz/side_angle_side_congruence_worksheetywpz6.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://7f3dc8b3-869c-44c5-82eb-14ae88d57796.filesusr.com/ugd/dc4ca1_f4e4df5dbb454052b85c43b08df117a8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe9be66e-b132-4f32-bc06-4dde822b094e/hamilton_beach_steam_irons_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/masevewi/bone_density_report_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/bstc_paper_2018_answer_key.pdfIn PDF document text
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_ab7013a8954d4d0ab9487d54e5a9787c.pdf?index=trueIn PDF document text
    • http://suwuxuk.epizy.com/23319573026.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd6a3990-999e-491c-896d-fb0ba0e1e4f8/kenmore_coldspot_refrigerator_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64ffc93c-5588-4ddd-9df8-b592fc01d08a/which_countries_passes_through_tropic_of_cancer.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_off0000d8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AA 5492 bytes
SHA-256: 1218306333e12ebd802b6f438c5bc8b701791f60abba9dc688c5373ce2d5a991
font_01_sfnt_off0000eb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB22 10932 bytes
SHA-256: 3f39a90e297f45ff2b089abee4e3d241f92cb1c9e5dc2e8730e42eb089c9c73a
font_02_sfnt_off0001100a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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