Malicious PDF — malware analysis report

Static analysis result for SHA-256 35ebb71049f8c11b…

MALICIOUS

PDF

70.3 KB Created: 2021-05-19 13:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 344d728cffe01e3d0ce139b8fce1e6dc SHA-1: a8d1093fde4e3d5275b6646d97517d5cafb5e636 SHA-256: 35ebb71049f8c11bdabc8a02c06316628cbc3705ea97dd311892a026cd5472b1
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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://seumenha.ru/strik?utm_term=ubuntu+michael+tellinger+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406169/normal_605dcc2e4ab13.pdfIn PDF document text
    • https://dufowazana.weebly.com/uploads/1/3/4/5/134529111/1967512.pdfIn PDF document text
    • https://popetufuwude.weebly.com/uploads/1/3/1/4/131483025/5e8e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417809/normal_6047810e6f05a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416929/normal_6036c233436fd.pdfIn PDF document text
    • https://ginadilu.weebly.com/uploads/1/3/4/7/134768391/9946138.pdfIn PDF document text
    • https://jevetokisavov.weebly.com/uploads/1/3/3/9/133997370/dotokodedelifeximim.pdfIn PDF document text
    • https://pasojifet.weebly.com/uploads/1/3/0/7/130776368/4469167.pdfIn PDF document text
    • https://gekafokolasiga.weebly.com/uploads/1/3/1/3/131384301/a3fababa8b2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447101/normal_6044cc237d1b5.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/begijufadi/87249901123.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/jeux_interdits_romance_for_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bfbc0da-5834-454c-80f8-d1fa5f2de4cb/77589899896.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfb16aa5-b3f7-4e77-91c8-9bf18ebd682f/defabobegekutavesefuzubi.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/26287538960.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/brawl_stars_private_server_2019_android.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/where_does_avid_application_manager_store_s.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/call_rest_api_using_resttemplate.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/tissot_t_touch_expert_solar_2_vs_1.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/editable_label_templates_free.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_off0000d698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD698 5520 bytes
SHA-256: 512bb6a25609772ecda3035af75a5006ef4c8596f21bdeb6065f883b3b0803f1
font_01_sfnt_off0000e931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE931 10184 bytes
SHA-256: 30779dcb5eb8c88d30afc36923b5881e131d9d6dc01c56f12f836b737a178139

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