Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcde156501bb8df7…

MALICIOUS

PDF

76.3 KB Created: 2021-05-15 23:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 3dd22b475f8b8a83a983cc60cbddf1ce SHA-1: 235d4bb23ea71f4ac7cdf2c735bf3783efe1dd6f SHA-256: dcde156501bb8df7196d76acae02c2613b144acdba0aba05c28cfd6110bb514b
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the heuristic firings suggest the primary attack vector is the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/strik?utm_term=sandisk+sansa+fuze+battery+replacement In PDF document text
    • http://bemijaragilez.22web.org/adhikar_old_movie_songs.pdfIn PDF document text
    • http://gebevojika.mygamesonline.org/bonne_pratique_de_fabrication_alimentaire.pdfIn PDF document text
    • https://sofamilases.weebly.com/uploads/1/3/5/4/135401016/zoruvegagi.pdfIn PDF document text
    • https://rizedugo.weebly.com/uploads/1/3/1/4/131453818/865e43d38afce5.pdfIn PDF document text
    • https://cdn.sqhk.co/birenejar/e3biagi/download_zombie_shooting_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/nozedimasav/hbEhhHb/naruto_x_boruto_ninja_voltage_mod_apk_revdl.pdfIn PDF document text
    • https://tagelararejo.weebly.com/uploads/1/3/4/8/134846357/fekesite.pdfIn PDF document text
    • https://xojumupaxasa.weebly.com/uploads/1/3/4/6/134605953/gulexemifip_jipunoteme_gumobasuxu.pdfIn PDF document text
    • http://popisazono.getenjoyment.net/angeles_y_demonios_filetype.pdfIn PDF document text
    • https://pefibiwurabamiz.weebly.com/uploads/1/3/0/8/130874510/1210462.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://manugefax.epizy.com/78961161517.pdfIn PDF document text
    • http://ropupifalapoges.atwebpages.com/tevule.pdfIn PDF document text
    • https://2bb9e989-9ce9-409f-aa8a-839f2ea8d3bf.filesusr.com/ugd/9f8cc2_67fd0d43d3364319a1faeb5655ffff8c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/palevijuj/cocoon_travel_sheet_silk.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/95582511729.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/tanigag.pdfIn PDF document text
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_81ca6a2b4c294295b70d4410ef01f64d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/31489365129.pdfIn PDF document text
    • http://talulof.epizy.com/literary_devices_in_poems_worksheet.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_off0000e95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95B 5760 bytes
SHA-256: 95653d4db36c2184f443e4ba11930d5a64185cefd5937fd82106639ff1886eb4
font_01_sfnt_off0000fcf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF8 11008 bytes
SHA-256: 5335c84f898fe4f01ab2ae838ceff2f29cf8bc0161fdd439d9188f24c6a4f281

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