Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbde8693757be75e…

MALICIOUS

PDF

81.7 KB Created: 2021-05-01 22:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 53401e0c6ad55f3158875d03461aca05 SHA-1: 2b97f2b371118ffeee768f8602ec8cbbadb7b88e SHA-256: dbde8693757be75e601508bc2dc532aee585c0da4efea50e5a6165c284278485
246 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains a link farm and specifically impersonates Apple for credential phishing. The embedded URLs and the nature of the heuristics strongly suggest a phishing attack vector, likely delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://jotulamopusojo.weebly.com/uploads/1/3/4/4/134465369/xogemepowabawej-figuwibuguz-lodonibil.pdf.
  • 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://druttle.ru/strik?utm_term=how+to+update+garmin+oregon+450t PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475729/normal_60386e96a915b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412387/normal_5fea19571e684.pdfIn PDF document text
    • https://jotulamopusojo.weebly.com/uploads/1/3/4/4/134465369/xogemepowabawej-figuwibuguz-lodonibil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383699/normal_600d069e14705.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383460/normal_603b7be92b8f9.pdfIn PDF document text
    • https://fimizugowukabi.weebly.com/uploads/1/3/1/1/131164572/6641111.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393029/normal_603427ab86be7.pdfIn PDF document text
    • https://noduxulab.weebly.com/uploads/1/3/4/9/134901810/zajurowezen.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/c45387da-48b7-43e7-aa18-941b9ff7acb3/55063797035.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/333550f5-b1b4-493b-b626-6d90783450c1/warcraft_iii_remastered_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87bc1702-c39a-4a9b-a205-9de05510d0e8/77933179361.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b124cc96-48d9-464c-868f-28e7c6db7214/does_powerade_help_you_lose_weight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b4d7cf8-2c57-495f-83d5-a26663ce97bd/32577650952.pdfIn PDF document text
    • https://054d5c26-596f-48a3-87a7-0fc79031e5db.filesusr.com/ugd/599026_a7564b7824114d6db1a628cdfb45b8f9.pdf?index=trueIn PDF document text
    • http://sesosufavi.epizy.com/callese_y_venda_completo_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba835580-aee7-4fe5-a239-f3e6fffa844d/9866469257.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4fd71bf-cea5-4d9c-926b-779b0fc817a1/49427630032.pdfIn PDF document text
    • https://fdb4f28e-c637-431f-967d-457feef73efb.filesusr.com/ugd/cf5aa9_abf1ac81663a464eae359ed3e7c428ed.pdf?index=trueIn PDF document text
    • http://duzifamu.epizy.com/23253946647.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_off00010001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10001 5476 bytes
SHA-256: dfbcf561678fbd0476ca045b988197ce207ff6e06e3cbeca4972d2e38ea6b299
font_01_sfnt_off000112a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A3 11400 bytes
SHA-256: 33ab65c045006253320b62650a354a0705dec3391cb3e779698062b82744f2c3