Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c61abfac95c4e48…

MALICIOUS

PDF

79.3 KB Created: 2021-05-30 06:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 025d71ea9178dfeeb0d903f1b0ad0ec6 SHA-1: 58bf32ac53219e95ffd868e781bb259958e9ff0c SHA-256: 2c61abfac95c4e48376b478b73730da756f41ecd889c31ef2d38cf595871316c
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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
  • 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=d%2527+accord+french+1+answers PDF link annotation
    • https://betetudiju.weebly.com/uploads/1/3/5/3/135348010/wamakivikazati-nebej-wowugiwobewatav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488323/normal_5fdda8b2c0be5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490930/normal_600b63b429524.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4410016/normal_60afe997f306a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470521/normal_5fd81280213bd.pdfIn PDF document text
    • https://teribizekejuxes.weebly.com/uploads/1/3/5/3/135391999/5910989.pdfIn PDF document text
    • https://zudafafaji.weebly.com/uploads/1/3/4/5/134508934/6738580.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480749/normal_5ffbde3af24f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377924/normal_5ffc7fa71f9a5.pdfIn PDF document text
    • https://xoxazibazosilex.weebly.com/uploads/1/3/4/5/134590820/xesesosegit_lefijafiruroke_gimomoz_rejidivezeje.pdfIn PDF document text
    • https://fexaxotira.weebly.com/uploads/1/3/5/4/135401388/8018903.pdfIn PDF document text
    • https://zokijirimabijim.weebly.com/uploads/1/3/5/9/135964806/1842729.pdfIn PDF document text
    • https://wubepina.weebly.com/uploads/1/3/4/7/134721378/pawebodatogada_zukorosafuris_tebedigixuwapi_jemobam.pdfIn PDF document text
    • https://befofevaz.weebly.com/uploads/1/3/0/9/130969220/lilelesizi.pdfIn PDF document text
    • https://jatekowi.weebly.com/uploads/1/3/0/7/130776123/aaff5d975d02ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426955/normal_6018809c60094.pdfIn PDF document text
    • https://sirukume.weebly.com/uploads/1/3/0/8/130814715/tupugaforup.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/65e53ecc-ed2c-42c5-a83e-05d9b0f9dadc/what_is_the_main_idea_of_the_crucible_act_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2115ae4-edbb-47ef-a150-cef107b331e9/where_is_ming_china.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9be8a86-1e3c-4313-864d-8efc962c46d7/how_to_find_the_geometric_mean_of_a_right_triangle.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_off0000f47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47A 5256 bytes
SHA-256: de37b5e05456e128e47eee00abb160275da07cf182d20ff7444d3a0f96838a27
font_01_sfnt_off00010679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10679 12788 bytes
SHA-256: 45a8acc66298f77c3957adebc5b8782dcbb631aac73176368bcaea7818081c42