Malicious PDF — malware analysis report

Static analysis result for SHA-256 7660c9036d33838b…

MALICIOUS

PDF

83.3 KB Created: 2020-11-10 13:00:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: cee3e9d43f82cf5b5bcf8d8666b5e972 SHA-1: 914790b2917ee04d44108e6b8b2ece9879b7096f SHA-256: 7660c9036d33838b5ef83ec013453c252c5cc57dcd76d4ae432c553c453c88e0
244 Risk Score

Malware Insights

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

This PDF file was detected as malicious by multiple heuristics and a machine learning classifier, indicating it likely serves as a phishing or redirection lure. It contains a large number of embedded URLs, including a known malicious redirector at 'https://cctraff.ru/123?keyword=papa+s+cupcakeria+unblocked+games+77', suggesting an attempt to lead users to harmful sites. The document body is heavily obfuscated and appears to contain metadata rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/123?keyword=papa+s+cupcakeria+unblocked+games+77 In PDF document text
    • https://rumeravovavupol.weebly.com/uploads/1/3/4/6/134619367/2e71a428c26405a.pdfIn PDF document text
    • https://rozenawaxu.weebly.com/uploads/1/3/4/5/134517597/wusajofobamobox.pdfIn PDF document text
    • https://wumudirega.weebly.com/uploads/1/3/4/5/134515906/gijedojoledite.pdfIn PDF document text
    • https://rugazodexozapef.weebly.com/uploads/1/3/4/4/134480570/gilejalamokunup_mibofokoze_lewigedunu.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/9247351.pdfIn PDF document text
    • https://dibozavo.weebly.com/uploads/1/3/4/5/134501923/4151e691.pdfIn PDF document text
    • https://xaxexapiro.weebly.com/uploads/1/3/1/4/131453807/digunujup_zisiw_vapasamolasupen.pdfIn PDF document text
    • https://wirukibit.weebly.com/uploads/1/3/0/9/130969322/dfe3ba20dcd.pdfIn PDF document text
    • https://wajiresejepo.weebly.com/uploads/1/3/0/7/130774962/javimokudafaxe.pdfIn PDF document text
    • https://dawugagulinejud.weebly.com/uploads/1/3/4/3/134368664/4fe8e2.pdfIn PDF document text
    • https://wefolukozik.weebly.com/uploads/1/3/1/4/131406413/f831e3bd630600.pdfIn PDF document text
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/15022.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e5a7b3e-29f4-420e-a930-b52d1c6053f5/noah_s_ark_math_problem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/149085dd-7c2b-4c41-83ee-a45e868ed3cb/pojewi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01b99303-21e0-4da3-b8a0-f97e79d39d47/57888981370.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/jessica_ballentine_facebook.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/cnu_schedule_of_classes_spring_2020.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD287 7704 bytes
SHA-256: 05b0461f237c417de68bf6aa85bc54f59cdd8ecf4c08a5a8febbedd47379bd02
font_01_sfnt_off0000ec5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5D 5680 bytes
SHA-256: 25e7d6791c3a485f69002e64fb387bf442310033e37139d45ef050cc87d780cb
font_02_sfnt_off0000ff9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9E 11488 bytes
SHA-256: 32682145af372393347861f66abb66e089d711fc9fa3b41237b65f7654afa50e
font_03_sfnt_off0001250b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250B 16804 bytes
SHA-256: 4db83bf4e7227c2a3a2cc53dc3ac4273f468d008a3b42f3c76bbc92e27d82814