Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8cbfa8f3d288ae…

MALICIOUS

PDF

67.2 KB Created: 2021-06-15 13:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a8539e41ab0e08f7a1fd0e31dbc31d84 SHA-1: 56dbf7abfcb4d987758ba089a1c11c5a335bbdbd SHA-256: 8f8cbfa8f3d288aef0f4139cea2881caaa8bcc699f0f92476831e8b684233e28
186 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 6

  • 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.
  • 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://cructi.ru/pbw?utm_term=download+a+level+physics+redspot+pdf PDF link annotation
    • https://rigoxetevub.weebly.com/uploads/1/3/4/0/134017132/c573f.pdfIn PDF document text
    • https://liburesaxus.weebly.com/uploads/1/3/4/3/134372769/vilafesenitivo.pdfIn PDF document text
    • https://judiwufafa.weebly.com/uploads/1/3/3/9/133999980/2578885.pdfIn PDF document text
    • https://xapabareduvan.weebly.com/uploads/1/3/4/3/134395213/1535472.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491159/normal_5fd671df77663.pdfIn PDF document text
    • https://gunitawuxinunew.weebly.com/uploads/1/3/4/7/134713868/870f096cc2d.pdfIn PDF document text
    • https://talunijepi.weebly.com/uploads/1/3/4/5/134599753/6554541.pdfIn PDF document text
    • https://jefelowomiwit.weebly.com/uploads/1/3/4/5/134599681/labifozuwatefawejo.pdfIn PDF document text
    • https://vubinejenifa.weebly.com/uploads/1/3/4/4/134444695/cd168e.pdfIn PDF document text
    • https://fefedajukuda.weebly.com/uploads/1/3/1/0/131070841/jozadusis.pdfIn PDF document text
    • https://zogudoweno.weebly.com/uploads/1/3/1/6/131637773/f9a16339a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382780/normal_6069ecffe112f.pdfIn PDF document text
    • https://wikaxefukefep.weebly.com/uploads/1/3/4/5/134519338/4907178.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://saladolu.pbworks.com/w/file/fetch/145087461/battle_royale_games_for_pc_download.pdfIn PDF document text
    • http://gipomebepate.pbworks.com/w/file/fetch/145046883/barbie_dream_house_unlock_vip.pdfIn PDF document text
    • http://garigor.pbworks.com/f/pesaguvasekaban.pdfIn PDF document text
    • http://luwivaj.pbworks.com/f/the_legend_of_zelda_ocarina_of_time_official_strategy_guide.pdfIn PDF document text
    • http://bitejite.pbworks.com/f/th9_elixir_army.pdfIn PDF document text
    • http://mituxap.pbworks.com/f/26900609275.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_off0000c892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC892 5496 bytes
SHA-256: 12b8ff1d0dadb5fbb597994602c80a3c0795173a6a0bd41ad170fc706cd5ac34
font_01_sfnt_off0000db64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB64 10708 bytes
SHA-256: cffefbadb2539724cc8a642ad6691275f7320313c71fb256e6d8c917b49a159a

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