Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea8aa7e3c7333fa6…

MALICIOUS

PDF

76.9 KB Created: 2021-06-03 17:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 51ffa4cc77d18f6a7ded140ba0549192 SHA-1: db89ea63a4efb1088dd75890249ef8247b8678ac SHA-256: ea8aa7e3c7333fa6276341f90d95d536fbdb4d06275ff890da4c7992e22f5bb0
186 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links to external websites, many hosted on disposable domains, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though partially corrupted, mentions 'writing activities' and the authoring application suggests it was generated programmatically, likely to obscure its true purpose of directing users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://coretry.ru/pbw?utm_term=brown+bear+brown+bear+what+do+you+see+writing+activities PDF link annotation
    • https://rusudunan.weebly.com/uploads/1/3/2/6/132681855/pudavunofe_tavizoti.pdfIn PDF document text
    • https://mibaxezaju.weebly.com/uploads/1/3/4/6/134641270/bozolimemiduzo.pdfIn PDF document text
    • https://pituluwo.weebly.com/uploads/1/3/1/4/131437949/5256875.pdfIn PDF document text
    • https://zemejinifuv.weebly.com/uploads/1/3/4/5/134577925/2128586.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393044/normal_6006989b12acf.pdfIn PDF document text
    • https://xiwupezarevapo.weebly.com/uploads/1/3/2/6/132681984/sitorakabol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369507/normal_5fffcaf0948c5.pdfIn PDF document text
    • https://mibonujatupogu.weebly.com/uploads/1/3/5/2/135297119/bdef650a447c922.pdfIn PDF document text
    • https://fefedajukuda.weebly.com/uploads/1/3/1/0/131070841/zuledabose-zirojab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://funinupun.pbworks.com/w/file/fetch/144418242/the_pmi-acp_exam_how_to_pass_on_your_first_try_iteration_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26dfd120-0c8b-41b2-9ec5-988a51c3877f/how_to_play_croquet_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71e3a317-d4c7-498d-979a-20f4f7334861/how_to_check_mview_log_table.pdfIn PDF document text
    • http://banusiv.pbworks.com/f/reginafagesefotizajigogal.pdfIn PDF document text
    • http://pagorevet.pbworks.com/w/file/fetch/144448635/pokemon_gba_rom_hack_with_best_graphics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a6122f7-bcce-4ad6-9804-9a35554886e8/spider_man_158_comics_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fb1e07f-8873-4103-814a-88522584ca9b/how_to_be_a_dogs_best_friend.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbe2f195-011c-4d96-9397-1cbf3adb4357/panasonic_es8243a_manual.pdfIn PDF document text
    • http://bofamawetodo.pbworks.com/w/file/fetch/144566859/problemas_de_sistemas_de_ecuaciones_no_lineales_4o_eso.pdfIn PDF document text
    • http://niwomif.pbworks.com/w/file/fetch/144427812/butonapujanixizunidogo.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_off0000edd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD0 5612 bytes
SHA-256: dc2a6f1d81a75c41a6a1b2e1101932fadf2bff0580e7869a75a63523816cfd54
font_01_sfnt_off00010105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10105 10672 bytes
SHA-256: ff4f8adb4321d8c6a89eda6997828378250e6bdf70c9792202c4065e071f2c8a