Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac57f8b0afd24bcd…

MALICIOUS

PDF

68.8 KB Created: 2021-01-15 06:31:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ed01d0860d75da3afce7b828d2254cee SHA-1: 9dbf8aad565eca83b7ad950bfdfe8b8d5925916a SHA-256: ac57f8b0afd24bcd1fd40839221be4c31deb06254e4797764aae12d73533c224
222 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 'ggtraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The presence of embedded URLs and the redirector link suggest an attempt to lead the user to a malicious site, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ggtraff.ru/aws?utm_term=autocad+lt+2018+manual+pdf In PDF document text
    • https://waxuzimad.weebly.com/uploads/1/3/4/8/134852209/6507538.pdfIn PDF document text
    • https://xikematevi.weebly.com/uploads/1/3/4/3/134392378/5520504.pdfIn PDF document text
    • https://site-1176797.mozfiles.com/files/1176797/scruffy_beard_filter_snapchat.pdfIn PDF document text
    • https://borobufa.weebly.com/uploads/1/3/1/4/131406827/5545996.pdfIn PDF document text
    • https://dojifidixiwaji.weebly.com/uploads/1/3/4/3/134372722/givewesuzam-tikapaza.pdfIn PDF document text
    • https://zewemoledomuro.weebly.com/uploads/1/3/4/7/134746436/tusonamo-sanamerufoka.pdfIn PDF document text
    • https://site-1172574.mozfiles.com/files/1172574/lokumopugavugatuvu.pdfIn PDF document text
    • https://nowigusoludi.weebly.com/uploads/1/3/4/2/134266380/sixukodasofaxe_dowefebira_folisovawa_tunewujiwopome.pdfIn PDF document text
    • https://mevimozow.weebly.com/uploads/1/3/0/7/130776561/pufubiwas_ludexose_jivejedodaz_tutobetudun.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/gifiz/hays_legal_salary_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/riverside_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/propositional_logic_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/episode_66_my_hero_dub_free.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_off0000d14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14E 5536 bytes
SHA-256: 5a82194ca02c07a3ca02a02b5e0f8579283373d416d93493f55387c4ed574c4d
font_01_sfnt_off0000e41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41E 10104 bytes
SHA-256: 29f107daf8e3e558e6c03edc7498c840359991fda5db03b58f81faca8e87fb3a

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