Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4e79d316ba4560…

MALICIOUS

PDF

91.7 KB Created: 2021-03-25 06:04:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: edbcc17ddd6de8bec44e137fbe5d12c8 SHA-1: b920011330fcb7419f8bcf68d7cf05d546fdadcd SHA-256: bf4e79d316ba45606de66fd47ed0fe5d858e2d030c227770274d0248009fa20d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of numerous external links suggests an attempt to direct users to malicious content or exploit kits.

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
  • 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://vilenefex.ru/strik?utm_term=one+punch+man+blast+real+identity PDF link annotation
    • http://oneitshop.pro/laptop_acer_aspire_v5_touch_screenoyk9u.pdfIn PDF document text
    • https://lenapejasuma.weebly.com/uploads/1/3/4/7/134749539/efb7289151941aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368503/normal_5fcc57f591076.pdfIn PDF document text
    • http://birixuxewazotaz.mywebcommunity.org/8051_architecture_and_pin_diagram.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460966/normal_601ce2a3d4976.pdfIn PDF document text
    • https://vopemafewiza.weebly.com/uploads/1/3/1/4/131408930/legitig.pdfIn PDF document text
    • http://hayatevesigar.online/how_to_draw_scary_monsters_easy2kru6.pdfIn PDF document text
    • http://jekenufakewe.mypressonline.com/list_of_harry_potter_books_in_spanish.pdfIn PDF document text
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/sudisagitibari.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473938/normal_5fdc3cec643b9.pdfIn PDF document text
    • https://wagofokixe.weebly.com/uploads/1/3/4/6/134694124/rojutobeneweta_golime_fipin.pdfIn PDF document text
    • http://myluckywin.site/sopuvokujotagiztl0r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367631/normal_5fd96357e2f45.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/7736bd69-6b9c-46a9-90d7-dc63ba33cf86/who_owns_the_property_grantor_or_grantee.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fe128b0-cad1-47ec-aa99-f703461f36a7/57709239332.pdfIn PDF document text
    • http://jimomurapujivo.onlinewebshop.net/86519649694.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ae96be5-d06f-4491-be9c-e26ac996af6b/70809376132.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a732db2d-57cf-468d-95c1-c6a772987cab/96251176967.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1194a771-a248-4e98-b698-0849e322fbb6/hp_officejet_pro_8500a_printer_driver_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ef1345c-8c2d-419a-98a5-a806c6679e16/fozobuka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2c28ec0-8949-45ae-8ab7-fb132dd6c61b/how_to_charge_my_kindle_fire.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB1 3492 bytes
SHA-256: 7ed9fbf0551f3751f080815903de66929bb93841ab4844afd3ed604f1ca4a867
font_01_sfnt_off00012829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12829 5580 bytes
SHA-256: 9952cafaa50d0cc661d1ea423f0bbfaf6ab8ca94824cc07bf9ae46008340d0b4
font_02_sfnt_off00013ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE9 11336 bytes
SHA-256: f921c0ae228f9d7121e156afc498a7b0ba62508aab85fd0d59e1ff8da91d90c9