Malicious PDF — malware analysis report

Static analysis result for SHA-256 243a6c34fc03c580…

MALICIOUS

PDF

76.1 KB Created: 2021-06-09 17:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbdcbb76fc7cbc1efcfbe81657264a41 SHA-1: 512a965e515974923a03267b30abbc295f2a864d SHA-256: 243a6c34fc03c5805c74973d6624b7a9a0e4e32e65061bb570d00a631cf20d27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. It contains numerous external links, with one pointing to 'https://cructi.ru/pbw?utm_term=ae+video+editor+android+apk', suggesting a phishing or malware distribution attempt. The ClamAV detection further supports its classification as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cructi.ru/pbw?utm_term=ae+video+editor+android+apk
    • https://jedarixires.weebly.com/uploads/1/3/0/9/130969076/2082010.pdf
    • https://pulisojoperun.weebly.com/uploads/1/3/4/4/134487891/fajasom.pdf
    • https://vumeganutubaxo.weebly.com/uploads/1/3/1/4/131406578/jarizubusom.pdf
    • https://mumevifovamix.weebly.com/uploads/1/3/4/4/134486033/afeefa28c67.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/68823b55-828f-4d81-a62a-235be18ace3c/pamujenagavanomajakazu.pdf
    • https://uploads.strikinglycdn.com/files/ec6820e7-2954-4b5e-8056-be571827efe5/zisisotokasibapak.pdf
    • http://mawasuwov.pbworks.com/f/how_to_reset_gate_remote_control.pdf
    • https://uploads.strikinglycdn.com/files/f88ba493-2f8b-4f64-9a5b-0345fa30d6e8/how_to_reset_blue_angels_citizen_watch.pdf
    • https://uploads.strikinglycdn.com/files/0f9f8fe2-5768-404e-8bc3-e9483695f9a7/jinakinu.pdf
    • https://uploads.strikinglycdn.com/files/981809cf-9e47-442b-adde-7601829f41c4/effective_modern_c.pdf
    • http://lekipirunezi.pbworks.com/w/file/fetch/144413619/33539284728.pdf
    • http://vazufatar.pbworks.com/w/file/fetch/144876516/butterflies_part_2_mp3_download.pdf
    • http://jorowad.pbworks.com/w/file/fetch/144814131/64014552553.pdf
    • http://ronejoxerer.pbworks.com/f/heavy_bus_mod.pdf
    • http://tijigika.pbworks.com/f/gozafupulex.pdf
    • https://uploads.strikinglycdn.com/files/c3eaba59-958a-4ba5-9771-71709a2ee4c0/brand_new_ranger_bass_boat_price.pdf
    • http://lenivuzuk.pbworks.com/w/file/fetch/144827253/ver_contraseas_de_wifi_guardadas_en_android_sin_root.pdf
    • https://uploads.strikinglycdn.com/files/01632c6d-8757-4ca4-afb2-2bf7ad8314b6/motata.pdf
    • http://gatasulupu.pbworks.com/f/saps_psychometric_test_2020_download.pdf
    • http://vazesuna.pbworks.com/f/fitobalomezalulofefugojow.pdf
    • https://uploads.strikinglycdn.com/files/f556153e-f614-4778-979d-40978b601deb/83274562687.pdf
    • https://uploads.strikinglycdn.com/files/ce589473-c21c-4859-8c2b-1ca0247b64d7/hebrew_bible_with_strongs_numbers.pdf
    • http://lezakoliz.pbworks.com/f/how_to_write_an_email_asking_for_information_from_client.pdf
    • http://wisarazed.pbworks.com/f/42281867365.pdf
    • http://sazupamufode.pbworks.com/w/file/fetch/144635922/tafoz.pdf
    • https://uploads.strikinglycdn.com/files/671c0fc8-259e-49e2-b1cd-b72f57d75799/black_and_decker_dustbuster_14.4v_chv1408.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea67.bin
5dd292e01b02d7850bb4f78cabf364ed15e5867aa4dbc031f9b840bed0d586f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA67 4856 bytes
font_01_sfnt_off0000fb01.bin
70cb5bf5537c31c78821870a3cd8199b1ece3d5ac217207067db66ea778101f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB01 12456 bytes

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