Malicious PDF — malware analysis report

Static analysis result for SHA-256 19baedfbbe758e15…

MALICIOUS

PDF

77.5 KB Created: 2021-03-01 20:51:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: def4b64b0a2bd69a72ca876ac69cb88b SHA-1: d522eed2e1a4b289b6f556801a3e95d0546b3249 SHA-256: 19baedfbbe758e15e6620c64820fdd9c5bb1611db32163855fc2bdf714a0f957
234 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to known malicious redirector infrastructure or are part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or SEO spam. No scripts were extracted, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=dell+optiplex+7010+sff+expansion+slots In PDF document text
    • https://cdn-cms.f-static.net/uploads/4419849/normal_601db209d88cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489257/normal_5ff9ff16cdfc1.pdfIn PDF document text
    • https://rizomoxus.weebly.com/uploads/1/3/4/5/134589692/vutalubamuwilaneg.pdfIn PDF document text
    • https://repawuwo.weebly.com/uploads/1/3/5/3/135313919/sikinijojezo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369626/normal_5fd15b799debe.pdfIn PDF document text
    • https://jojobejuw.weebly.com/uploads/1/3/2/8/132815094/fofifev.pdfIn PDF document text
    • https://valojeruxul.weebly.com/uploads/1/3/4/6/134681631/ca2d9853.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/annotate_secured.pdfIn PDF document text
    • http://boxemoje.epizy.com/dozamirebudepudama.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/oklahoma_driver_s_manual_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/brother_mfc_240c_driver.pdfIn PDF document text
    • http://pitupeg.epizy.com/45652570724.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/problem_solving_skills_training_manual.pdfIn PDF document text
    • http://kezakixekinefa.rf.gd/90633865251.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/add_spreadsheet_to_google_form.pdfIn PDF document text
    • http://zudosikewemer.epizy.com/77499254042.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/merekosularelutofuromez.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_off0000ee32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE32 5140 bytes
SHA-256: ce54534fb21388845dcf228662893558a756289a46c211858376a584f253041e
font_01_sfnt_off0000ffe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE2 11688 bytes
SHA-256: 10375ca3046be154b1f11ddb766d9a1e30b01086401e0d0d93c7cc08570755da

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