Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b6a5f893bcf0c8…

MALICIOUS

PDF

88.0 KB Created: 2021-03-01 13:09:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8d74cf0c14b9c35ee8b0d030ef4f2cf1 SHA-1: 5c69b2299b6cb196178879bd76797012b54329cc SHA-256: 40b6a5f893bcf0c8b7d7a75d93280dd268b1de378062952ba8862a082583fb7c
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a redirector to known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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.
  • 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://dafemum.ru/wix?keyword=la+pasi%25C3%25B3n+de+cristo+descargar In PDF document text
    • http://ital-tess.space/vibemelibeb0j88b.pdfIn PDF document text
    • https://giwitororozesal.weebly.com/uploads/1/3/4/6/134652081/8d694.pdfIn PDF document text
    • https://fodolazaso.weebly.com/uploads/1/3/4/8/134891373/gukenonixoz.pdfIn PDF document text
    • http://copyright-security-ig.com/huniepop_unlock_guidenjz8y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385617/normal_60198046cc4cd.pdfIn PDF document text
    • https://bojibelatos.weebly.com/uploads/1/3/4/0/134040608/bogamedipujaw-zajakamilubu-rakusu.pdfIn PDF document text
    • http://fbcopyright-center.com/akhiyan_da_surma_chan_ve_ringtonez132d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504568/normal_5fd2f14e2cb12.pdfIn PDF document text
    • https://kexanitafax.weebly.com/uploads/1/3/0/8/130813084/4a2618.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403689/normal_602ac0a20b89e.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzivogawa/3Tbjhgc/50073969103.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/99884590721r0zxk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426686/normal_5fed5f1f44806.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/banula/balance_sheet_example_new_zealand.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/medical_certificate_format_for_admission.pdfIn PDF document text
    • http://nadurajamewe.epizy.com/smoker_melanosis_case_report.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_off00011664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11664 5288 bytes
SHA-256: 2e89337a067d5c52aa3b807f1a7cf92ad8c2c2a99352a4a81470244ea60409e2
font_01_sfnt_off00012832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12832 12596 bytes
SHA-256: d576b54b66a1b5400bc72204757827f5fad1adde8610cbb1d3dc2a5ace66807b

Open this report in the interactive analyzer, or submit your own file for analysis.