Malicious PDF — malware analysis report

Static analysis result for SHA-256 f876ce4d37ff2432…

MALICIOUS

PDF

69.2 KB Created: 2021-06-08 18:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 969e9e2efa346e19db669f0720666e5a SHA-1: cef5434fe76024a85cc64627e2fc69b3e77916e1 SHA-256: f876ce4d37ff2432072bf89b6c211fa9980b874817bad3bf6e12025a360de283
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs, with one prominent URL pointing to a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The PDF structure and embedded content, though heavily obfuscated, are consistent with techniques used to redirect users to malicious sites.

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://pistant.ru/pbw?utm_term=a+textbook+of+electrical+technology+by+bl+theraja+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4402246/normal_5ffe47419dcba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381101/normal_5fe8e70417c47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367302/normal_5ff485f5e49ac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://difusowafid.pbworks.com/f/50582496234.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c8e8acf-f553-4070-aa6d-2c516124d837/how_to_reset_weight_watchers_scale.pdfIn PDF document text
    • http://funuvutidip.pbworks.com/f/miwuno.pdfIn PDF document text
    • http://gifavipa.pbworks.com/f/13431116996.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2354a6be-e695-4ecc-ba95-8ae48dad2594/63926129229.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23ef29a3-2fcf-454b-bad4-b3dac0c4f277/sony_a330_lens_mount.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20af1e6c-df7c-4bb1-b2bb-70acb832b577/how_much_does_it_cost_to_replace_a_seiko_watch_battery.pdfIn PDF document text
    • http://natofuke.pbworks.com/w/file/fetch/144553227/6553786607.pdfIn PDF document text
    • http://fokurid.pbworks.com/f/download_fast_and_furious_tokyo_drift_720p_dual_audio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14935cff-a83d-4dc6-8499-2bec17837d4a/mini_cooper_service_intervals_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aa9e172-be29-44f6-b9d6-daef116f802a/20824925101.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf1d37e9-bcaa-4606-82eb-6ec2444e33ff/harry_potter_y_el_legado_maldito_pelcula_2020_estreno.pdfIn PDF document text
    • http://lutagunis.pbworks.com/f/where_does_diamond_willow_grow_in_alberta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa206711-a40b-40e0-b81c-26aacf6c183b/how_to_fix_ps4_controller_analog_stick_without_taking_it_apart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dd519d7-1594-4871-a8c6-f60a11a8f628/garmin_oregon_600_700.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_off0000cdea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEA 5680 bytes
SHA-256: ade8ecc22179b038654b6c83274e961c0d7fe5aa0d44364a3bc2ab8181e205e9
font_01_sfnt_off0000e150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE150 11184 bytes
SHA-256: 316869d301ef92822455a2c6f0438e69e8ffde2e809c118b4c940f4903522518

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