Malicious PDF — malware analysis report

Static analysis result for SHA-256 f22f95c1cb140461…

MALICIOUS

PDF

66.5 KB Created: 2020-11-24 06:35:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: d60b663470fa7175132d7a7052228444 SHA-1: d3cd67eade2facb38738456d33a72791389af07e SHA-256: f22f95c1cb14046199faa5b9c8c26b670071fd3e980f218fb7d1f8c2eb2a3118
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The embedded document body text, though partially corrupted, mentions 'Cae speaking part 1 pdf' and the authoring application 'wkhtmltopdf', suggesting a lure for search engine optimization or phishing. The presence of external URLs and the ML classifier's high confidence score indicate malicious intent, likely to redirect users to malicious sites.

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://trafffi.ru/aws?utm_term=cae+speaking+part+1+pdf PDF link annotation
    • https://pasabegimukug.weebly.com/uploads/1/3/4/2/134265340/3124887.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402014/normal_5f9505fc7497b.pdfIn PDF document text
    • https://judezirebesos.weebly.com/uploads/1/3/4/6/134669344/6714898.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccdf64c8-28ff-45d1-baec-ebb05aed851e/antique_coffee_grinder_price_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ef6d589-5ccb-4c30-a2a2-daf2ce0c0a76/29161772308.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f9aa55a-ab67-4888-9fd3-ad5b1cfd7472/french_stories_with_english_translation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3b701ed-4761-43c7-abc6-6332f7b08bc9/baperosoxojupifetodu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1052aa10-084b-4e8a-bd57-a4b5ae47e817/66770968858.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1b3b33f-d35b-42ec-8b82-c15d405789e6/radafaridakuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac208a8c-eafe-4d72-9186-7ff9de6db921/77979401455.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce24d7f6-2987-47a2-a53f-201bc687987d/whale_that_follows_your_mouse_unbloc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8565366-8258-483a-b178-347e50f79ea2/fossils_tell_of_long_ago_lesson_plans.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_off0000ca23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA23 5200 bytes
SHA-256: 90767f08b0dba9563eb733938dbae1a5d1b7e4149c2212bc7cebff614d940855
font_01_sfnt_off0000dbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE8 9904 bytes
SHA-256: 6d184fb1a2ff772e8191b7377d7673f748313e36687f8dbc126afe40b6f0f89e

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