Malicious PDF — malware analysis report

Static analysis result for SHA-256 05852d16d2508aeb…

MALICIOUS

PDF

71.4 KB Created: 2021-02-28 00:06:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 075cd0b9a537fa81e47b34461a759817 SHA-1: dba5f5af50def5e0b103f04b3537575f6590c86b SHA-256: 05852d16d2508aeba7b0d56ff3fdd38640e62bf5611fb61c8c24590ba22abc0e
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one specifically pointing to 'zajinet.ru' and a keyword related to a children's centre, suggesting a lure for phishing or malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

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
  • 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://zajinet.ru/wix?keyword=children%2527s+centre+of+thunder+bay PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473379/normal_6026f710eb5ff.pdfIn PDF document text
    • http://josumewemuzob.getenjoyment.net/krups_12_cup_coffee_maker_stainless_steel.pdfIn PDF document text
    • https://mimasalidapu.weebly.com/uploads/1/3/4/4/134466186/7b6f234402f.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/how_to_self_teach_philosophy.pdfIn PDF document text
    • https://fidifeso.weebly.com/uploads/1/3/1/4/131408027/jijijodode-fopobitezetojap.pdfIn PDF document text
    • https://vukuzimina.weebly.com/uploads/1/3/4/1/134109202/9981121.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/geraromu/34848078557.pdfIn PDF document text
    • http://mipuvofelope.epizy.com/96383250725.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/free_video_player_for_ubuntu.pdfIn PDF document text
    • http://pulutugorivexek.atwebpages.com/zenuxov.pdfIn PDF document text
    • http://vilepobafomunow.atwebpages.com/tcp_ip_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/cisco_anyconnect_client_from_asa.pdfIn PDF document text
    • http://repafow.epizy.com/48494582153.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5D 5292 bytes
SHA-256: 05fbc2cc0e5444d042738410b81dbb20b978c3870081480329cc563ef26919e2
font_01_sfnt_off0000e055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE055 10016 bytes
SHA-256: 225adb1e5eeb11528ecf13269f3c60a0791725faaf837e33e5fc3662ea524e0e
font_02_sfnt_off000102a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A7 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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