Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d9d094f2164f09…

MALICIOUS

PDF

67.2 KB Created: 2021-02-16 11:00:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 43655c7765ab7a343e84063dd2a056b9 SHA-1: ac7e2f4a09a4f1fda65476c00eb78d00a98d80a3 SHA-256: 61d9d094f2164f09c79deb5b2575414320aef298e08da7fb37f06a8abb4c8e9e
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/123?utm_term=what+is+your+favourite+dog'. Additionally, ClamAV detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-10044375-0'. The ML classifier also flagged it with a high probability of being malicious. The embedded URLs suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/123?utm_term=what+is+your+favourite+dog In PDF document text
    • http://italy50wow.pro/kexelalexa5kuj1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471706/normal_60004d6a09951.pdfIn PDF document text
    • http://blaugrana.ru/25218675436jncvc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370785/normal_5ffb1af3a0b8a.pdfIn PDF document text
    • http://lnstagramcopyrightservices.org/yellow_frog_tape_lowesmkitr.pdfIn PDF document text
    • http://vsspb.ru/956569398239gndk.pdfIn PDF document text
    • https://cdn.sqhk.co/ludozenidi/UhjNwMy/gozonazuzixow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402250/normal_600302f8d4b2e.pdfIn PDF document text
    • https://cdn.sqhk.co/sesexibanobu/bW2gjif/multi_purpose_air_hockey_table.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379369/normal_5fd9fcd78e0ce.pdfIn PDF document text
    • http://flowerport.shop/mobogenie_helper_app_for_androidhbtk9.pdfIn PDF document text
    • https://cdn.sqhk.co/tumitibira/ihib08p/watutudalexedakeniza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452148/normal_60113f661c8bc.pdfIn PDF document text
    • https://cdn.sqhk.co/napumefu/bIhfigW/amazing_world_of_gumball_games_nightmare_in_elmore.pdfIn PDF document text
    • https://cdn.sqhk.co/fakodozug/gIjfZ5u/90960284354.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/xidulumexi/puvuz.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/96727398021.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/brick_attack_games_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/lutexovexekov.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_off0000cb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2C 5312 bytes
SHA-256: b276d7ca58585756e05815848a38d1bc97cf12ff50f008739c3c5b4570cf388b
font_01_sfnt_off0000dd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4E 10088 bytes
SHA-256: 2da5e791fc249ac342ad6fd8e19c33581f795d97d8b0cbfbb7f91003bfd97f2c

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