Malicious PDF — malware analysis report

Static analysis result for SHA-256 631108a38207f342…

MALICIOUS

PDF

73.9 KB Created: 2020-12-24 23:39:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: f57c50e1d97b2870b6f5feb3a97df705 SHA-1: ec1c3973511665d26b6f15a46c4f4ade8e315668 SHA-256: 631108a38207f342b39a2773f9ee1ea82e13b41beb7090f63176e044479ae286
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The presence of a large number of external links, many pointing to 'strikinglycdn.com' and 'weebly.com' domains, suggests a link farm or redirection mechanism. The primary malicious URL identified is 'https://trafficel.ru/strik?utm_term=define+value+in+elements+of+design', which likely serves as a lure or distribution point.

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 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://trafficel.ru/strik?utm_term=define+value+in+elements+of+design PDF link annotation
    • https://damokilusul.weebly.com/uploads/1/3/4/4/134463963/8a030325165ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474449/normal_5fc2d48f65cd2.pdfIn PDF document text
    • https://bemebedutor.weebly.com/uploads/1/3/4/6/134624352/movekeraxaxedojofew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482849/normal_5fd819b85f955.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/bd590e92-65e8-4f70-b935-57cc6fd7c849/fisher_price_jump_for_lights_and_music_recall.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14c86211-3bf4-49ed-a9d8-def0d3eaed3a/the_book_of_sand.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df1634e4-93d6-44e3-9b71-e4ab8b9bd3f1/61328038791.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb86d577-cda9-4f95-adc4-ee22354b02c4/24330886665.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1299d184-748f-4297-bc0d-0ecec07feae5/gixubozatufugiwebadufuler.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d95cd53-545f-4b17-ad4f-0b6aa97390d0/rumukibalusadatuluxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6072b589-9d5c-48f2-8749-59ee9c098c68/bail_bonds_manhattan_ny.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec5ce6b2-84e6-432d-bee5-22f10995bf12/baking_cookies_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f1ce538-e4bd-4b68-838f-fe51f17ee788/the_practice_of_ap_statistics_5th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69282920-c043-4443-810e-915ab87d0cd0/ohio_fair_plan_payment_options.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_off0000e5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A5 5192 bytes
SHA-256: c6b415f88ed57cfbbe363056d4042d577cc019404652aadab8b9271b197f6fab
font_01_sfnt_off0000f753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF753 10328 bytes
SHA-256: 3c8486d26a51e2923b89cc173d71b71ca8c2ef9487fc516768e72e936a971806

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