Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fffd87524196123…

MALICIOUS

PDF

68.5 KB Created: 2021-05-21 05:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 529b9161f4ffbbfca03a53e22ce7f5bf SHA-1: 578e8da21ebccf41d718efcb1ba5a5f40494e356 SHA-256: 9fffd87524196123efd19af325b997d0e4bb50a3cf1e0b70af1a6382eba8eed2
96 Risk Score

Malware Insights

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

The PDF file contains a URL that is likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to educational content to entice users to click the embedded malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://golowaki.ru/strik?utm_term=videos+de+las+silabas+para+aprender+a+leer PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4378165/normal_6004dc3bc7932.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451561/normal_60202e4656b09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405413/normal_6014ba0f2bee4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458618/normal_605ac2ec116ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490365/normal_5fe59c813955b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/doxifuba/tom_sawyer_und_huckleberry_finn_film_wiki.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/joomla_3._9_template_installing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cae520f-9f4e-4aa2-a2f5-1dbbaa0a1acf/rofobezisepa.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/33305562514.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/33486956622.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37734e34-3942-455f-a864-54e44fce1ca7/understanding_mass_haul_diagrams.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce0f7ab3-7976-426c-baa3-74c15f07dbe8/honda_hrc216_commercial_mower_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7179ab2c-ec09-4733-8f0b-9381aae6a66a/vezumosokejofarinimeriwa.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/wofafixojum.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/53270565404.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/who_is_to_blame_for_romeo_and_juliets_death_argumentative_essay_free.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/annexure_format_for_appointment_letter.pdfIn PDF document text
    • https://s3.amazonaws.com/popilo/how_do_you_bypass_the_parking_brake_for_dual_dvd_player.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/97403873295.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/tarzan_of_the_apes_movie_1932.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_off0000cc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5F 5056 bytes
SHA-256: 098dbb6680807732a433165da0241fc44c41d07fc680c9c8ee8768d2dd5dba64
font_01_sfnt_off0000dd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD97 11340 bytes
SHA-256: 52ee676bde935145c71555f14c56bdb0dfaae6271852e83ed4b5ab43f14609a8

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