Malicious PDF — malware analysis report

Static analysis result for SHA-256 2108bbb6c811eeea…

MALICIOUS

PDF

76.1 KB Created: 2021-04-25 19:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ee4c402878257b3edf5bb499f3486627 SHA-1: 2795e804e9d5f5db162c50cc4bbd98bd116aa85b SHA-256: 2108bbb6c811eeea1a07276c28c9b3c4f2443c52a14e9da3b87d3b5f95c3dfd3
134 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and a heuristic firing indicates a visual download button lure. The presence of external URIs suggests an attempt to redirect the user to malicious content or download further payloads.

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 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://golowaki.ru/strik?utm_term=altec+lansing+mini+life+jacket+jolt+reset PDF link annotation
    • https://lamipakowoj.weebly.com/uploads/1/3/2/8/132814468/vawide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502178/normal_601b8d0bf2bcf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391909/normal_6004938d36031.pdfIn PDF document text
    • http://raguvigawak.mypressonline.com/order_of_adjectives_worksheet_with_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389801/normal_5ff37ad9e5a5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500417/normal_6053217c1c4fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451574/normal_601cb0020a3f1.pdfIn PDF document text
    • https://jijovozezara.weebly.com/uploads/1/3/1/1/131163872/xedulewawemi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446382/normal_60062fe8e616f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476281/normal_604e2708d3b8c.pdfIn PDF document text
    • https://tenosufude.weebly.com/uploads/1/3/1/4/131455069/gunotimuga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401697/normal_601b9e47dab1b.pdfIn PDF document text
    • https://gobebirerelimi.weebly.com/uploads/1/3/4/6/134651667/9202674.pdfIn PDF document text
    • http://kedugobepuged.mywebcommunity.org/air_brake_system_troubleshooting.pdfIn PDF document text
    • https://timijajuvage.weebly.com/uploads/1/3/2/6/132683040/7582280.pdfIn PDF document text
    • https://wumifidadorubip.weebly.com/uploads/1/3/5/2/135298964/ee104.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501385/normal_601b87c848f32.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/83cebee6-bec7-46b1-a851-59295de83926/the_hitchhikers_guide_to_the_galaxy_chapter_21_summary.pdfIn PDF document text
    • http://juwukopegonamu.onlinewebshop.net/barnett_vortex_compound_bow_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e9b84c9-26ed-424c-ac4c-e0ff1e35b064/lunixofanujojav.pdfIn PDF document text
    • http://mulapoxe.onlinewebshop.net/praktikum_akuntansi_perusahaan_dagang.pdfIn PDF document text
    • http://pizuzol.onlinewebshop.net/21621845060.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6bfdafe-b455-4666-8cc8-c23e1ef42720/91854294063.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_off0000e6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FC 5332 bytes
SHA-256: 6d430179f194be7ae795415fc76431c9e9be26d42f39f811097305ac711464f1
font_01_sfnt_off0000f910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF910 12032 bytes
SHA-256: ab89a4a14b958c8c9cf9c8197826f8569edee1809debe7b538352382e5d1d50c