Malicious PDF — malware analysis report

Static analysis result for SHA-256 189788d0a353443b…

MALICIOUS

PDF

74.8 KB Created: 2021-05-31 02:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a13867345dc8090eea7aec8c7c4e4c8f SHA-1: d229ca6355f5066f00449573344c436da5a87276 SHA-256: 189788d0a353443b91fc91973096e4d61e7ee4802cbe8552593ea4aa5cb1eaac
164 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is part of a link farm and hosts external URIs, with one suspicious URL identified. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and external links suggest an attempt to redirect the user to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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
  • 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://mezovuduw.ru/123?utm_term=guide+dogs+adverts PDF link annotation
    • https://zewonawexekuke.weebly.com/uploads/1/3/4/3/134318694/7529360.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383137/normal_602155f77df92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461511/normal_5ff0be92204ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372371/normal_5feba5920ef10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417523/normal_5fe7de53165ef.pdfIn PDF document text
    • https://vixugusimuxomuj.weebly.com/uploads/1/3/0/9/130969476/zovitigelo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417306/normal_5ffc86142da02.pdfIn PDF document text
    • https://vesepuzimimewij.weebly.com/uploads/1/3/0/7/130776402/liwefatu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447267/normal_5fcb0045d6399.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427828/normal_602d262598fa1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425005/normal_5fc8acdbd404c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530429/normal_6020b59c47b12.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/4b381da1-631b-45b0-a93f-090b72524369/snow_white_evil_queen_costume_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2770653a-79b3-4e25-861c-01e7a3ca510c/types_of_glass_used_to_make_laboratory_glassware.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1dc4e37-a729-41f1-9eb6-0ad41fcaddfe/gerafiju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a080f7b-0e0b-4a0d-93b0-35234bf03062/samsung_un32j525daf_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/685abacf-dbaf-4db8-9f7c-81322a9cdbc8/i_love_to_draw_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13b4e721-f018-40e2-b3cf-e6dbb7133784/how_to_change_ink_cartridge_hp_deskjet_2541.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b7c16ac-aff4-4dc8-a4c6-3f5f75cbfaad/dnd_5e_warforged_cleric_of_the_forge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8734a5a8-6158-4dad-aacd-7bf0f6f61e83/delta_table_saw_small.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b44f700-3e59-40bf-a326-f2841ac294d0/simile_and_metaphor_worksheets_grade_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2983311c-5c90-43c6-82cb-5c27b2156c4f/how_to_calculate_the_potential_difference_between_two_plates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fa2e4f6-ebdb-4faf-823e-912c8908a8a7/13027481683.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_off0000ea01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA01 5052 bytes
SHA-256: 03fac33f9f044dd28a58b118f55e8088d788ce20dfb36a83f8be557de7ec6554
font_01_sfnt_off0000fb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4E 10188 bytes
SHA-256: 24cd596c76aadd0ecd1009f28dd27c2ae79fb40bb9432cdbc60a6e78034b7ae2