Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83c579358b33ddb…

MALICIOUS

PDF

75.5 KB Created: 2021-04-03 16:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20d70ec7a35dbb87e2b006481b24998b SHA-1: e9a394d72a90fa430e71bc675707849b0de96ee9 SHA-256: a83c579358b33ddbfeadf4315fc3f0b3ef0ba5bc78466ccefcab54d591f708cc
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for 'PDF_REPEATED_PAYLOAD_LINK_LURE' pointing to a URL that appears to be a phishing or malware distribution lure. Another heuristic, 'PDF_SEO_LINK_FARM', indicates a large number of external PDF links, suggesting a link farm for SEO manipulation or further distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Invisible/repeated PDF links deliver payload file critical PDF_REPEATED_PAYLOAD_LINK_LURE
    PDF uses invisible link annotations and points to a direct payload download. Repeated invisible links or lure-like payload names such as document/unlock/verify archives match malware-delivery PDF carriers where the page is only a prompt and the real payload is fetched from the linked URL.
  • 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
  • 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://midufefew.ru/wix?keyword=scotts+a%2526p+site+youtube.com
    • https://cdn.sqhk.co/xarozowuzosa/IYhiFkd/kevezetiviriguzosi.pdf
    • https://cdn.sqhk.co/fukonovum/vojgTXE/car_parking_3d_pro_city_car_driving.pdf
    • https://cdn.sqhk.co/felolavap/Q0ijy69/gurutik.pdf
    • https://cdn.sqhk.co/pixorikibam/hfTLhcr/original_asteroids_arcade_game_for_sale.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4cec88c2-e8a1-4b29-84bc-62a44d55d9a1/philips_norelco_series_9000_manual.pdf
    • https://uploads.strikinglycdn.com/files/ba77207d-f6e7-418a-a06c-deb010c35881/62132454512.pdf
    • https://cd9ed9ec-87d1-42be-9198-0b2de6c1db4d.filesusr.com/ugd/158fb9_ce650d91b84b47c98872660a3547bd92.pdf?index=true
    • https://s3.amazonaws.com/sisaxu/27452336807.pdf
    • https://s3.amazonaws.com/migivewuwe/44929265147.pdf
    • https://s3.amazonaws.com/dowavelaxam/nevisobej.pdf
    • https://s3.amazonaws.com/gotenukevepunin/utorrent_free_for_mac_10._5.pdf
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_c1db142b33c24db08e984f8abd683ae5.pdf?index=true
    • https://s3.amazonaws.com/mawesenasijoser/little_chief_smoker_recipes_jerky.pdf
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_d9634b24f6884abf98cf93258d28f7b7.pdf?index=true
    • https://s3.amazonaws.com/wovigebi/wedding_vows_for_her_template.pdf
    • https://s3.amazonaws.com/wizakokowe/54598589730.pdf
    • https://af6bd0e1-9fb2-4c52-b6e5-df6188d17e94.filesusr.com/ugd/771d18_8166eede47f64703a63917984bbf83af.pdf?index=true
    • https://uploads.strikinglycdn.com/files/566260f1-9dd6-409e-b038-dc214d1dcc62/power_pressure_cooker_xl_slow_cooker_recipes.pdf
    • https://s3.amazonaws.com/zasepo/difference_between_rational_and_irrational_numbers_ppt.pdf
    • https://5be7aec3-7d66-433b-ae1d-2bfb807ddf2a.filesusr.com/ugd/24deb6_d8866476d26e457fa1d6d0bc6be06699.pdf?index=true
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_ffa1a9033b7b41e8848600edf7d75b3c.pdf?index=true
    • https://s3.amazonaws.com/sasufufa/free_fitted_face_mask_pattern_printable.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_off0000e923.bin
115a727e6c66086ca84f698da5bcf98dbf8f7cc2d7740fe1ed77d1793df2cb90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE923 4768 bytes
font_01_sfnt_off0000f96e.bin
f27074b250dcdcc239b72e62a5711698846bf7fa764a9e349d7c345b5a28eb37		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF96E 11868 bytes

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