Malicious PDF — malware analysis report

Static analysis result for SHA-256 85af4554e2d1100b…

MALICIOUS

PDF

71.9 KB Created: 2021-03-27 11:43:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 238adcd0df71fe7bc2906bda773118c0 SHA-1: 5882490dc4654327ea1addc42c301f84a096bea3 SHA-256: 85af4554e2d1100b50d9685eeeed3a20dc01b63c1becbe3a3cb0c47666262cc6
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing indicating a link farm with numerous external URLs, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/123?utm_term=ocean+karol+g+piano+sheet+music
    • http://nijeratazuw.iblogger.org/the_sparrow_book_summary.pdf
    • http://nifokinugixo.22web.org/does_chrome_have_adobe_flash_player_built_in.pdf
    • https://cdn.sqhk.co/ziwetuvije/kaCV8Np/free_whatsapp_messenger_for_windows_phone.pdf
    • https://cdn.sqhk.co/xamizine/jcgehh0/82318978212.pdf
    • https://cdn.sqhk.co/sezabaxo/ahjvqfM/47843262577.pdf
    • http://xiwupulo.medianewsonline.com/vabowafa.pdf
    • http://bukupiduge.mypressonline.com/tumejavigo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dc688580-c0ec-4ade-910b-7abffd870ab4.filesusr.com/ugd/096b61_48864e07848442dc863a3ddfa363d082.pdf?index=true
    • http://bavotuvezomevi.myartsonline.com/rututodeb.pdf
    • https://a3abd3d7-f7e4-4b0c-86b7-ec358d8c805a.filesusr.com/ugd/97a3b3_f903a9e4439e41f2a7749b07528b0013.pdf?index=true
    • https://s3.amazonaws.com/sedimeraxufi/cpall_annual_report_2014.pdf
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_805a299256404231a4166bf6b8c751e0.pdf?index=true
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_b491973e111540159f267ecdb47cdde6.pdf?index=true
    • https://s3.amazonaws.com/dowadotiju/laser_cutting_machine_acrylic_sheet.pdf
    • https://12a3aa02-022d-4218-8efb-90aa4388683d.filesusr.com/ugd/6dfd9b_bdfbef09994b4f45aac3a373ef33af79.pdf?index=true
    • https://s3.amazonaws.com/tokit/wanamezexevoxor.pdf
    • https://s3.amazonaws.com/timituvupame/dipukalarimaporofotagon.pdf
    • https://5d94d51b-2702-4b64-8df3-eadd022f3edc.filesusr.com/ugd/2ddd39_5fb5fcab3c43425e8fd26bbc071f9a1e.pdf?index=true
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_02d1c4b44ec8479b88a3238043c682fe.pdf?index=true
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_8a0599f43ed841ee9ccc54da1b8df661.pdf?index=true
    • 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_off0000dafb.bin
089fb36966c9eb0f68a1088504e44b64ffb43a91d4087be17f307108feb390e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFB 5440 bytes
font_01_sfnt_off0000ed53.bin
7f5bb36d462714e2458d224414958469d873cd6f2a904143fba57eaab65ce7bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED53 10844 bytes

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