Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d3e338fe8dc0840…

MALICIOUS

PDF

78.1 KB Created: 2021-03-23 20:40:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3ad6807f17e03e3e399f6edbdecb8df1 SHA-1: 05695882a1fd385cea24266b0ff9cb3213ebb86a SHA-256: 0d3e338fe8dc0840f12fb4368acca13fbda91a4aa9656b935ae97d2ae0c1f81c
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating it's part of a link farm designed to manipulate search engine results. It also embeds an external URI pointing to 'seumenha.ru', which is likely malicious. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/123?utm_term=marvel+avengers+academy+mod+apk+latest PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4390664/normal_5fdde117d583c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473616/normal_601146a05a180.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424996/normal_5fd088cc56968.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444655/normal_60554110d7380.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/f756e7b9-ebf6-42d0-b9b7-00bdf433e182/how_does_blue_light_therapy_work.pdfIn PDF document text
    • https://64db0a9d-d2b7-4705-beb9-75cca7f1d068.filesusr.com/ugd/4c6241_b825be0e75194254b1ea52900886a136.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/playstation_lifetime_sales.pdfIn PDF document text
    • https://8d40832c-2e2b-4284-8151-bb35a16d80ac.filesusr.com/ugd/05d014_0b35c62dcb00449780b55acd463643dd.pdf?index=trueIn PDF document text
    • https://82656f1f-dd0f-4426-89ca-c5688288f975.filesusr.com/ugd/56de54_64b1fe6affdc4a0aad3cb65e1b0186e2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/afd16fbd-d6dc-4f1f-89da-9e17ba59232d/second_grade_vocabulary_workbook.pdfIn PDF document text
    • https://7292b199-6d7c-4e84-b646-7854114497ba.filesusr.com/ugd/53361e_37e474910d5a46c8913fcbb158124333.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/bajuzawepeg.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/tupagebokixepavup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94dc81d5-25db-4494-93d4-1f70d1909a83/subemabebagedasutitaziw.pdfIn PDF document text
    • https://a22c3535-4c29-4f26-bf6b-1e631d3648e5.filesusr.com/ugd/28986c_75214a5b6bc645a08bf621650f3c5cb6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/85888e94-d91a-49c8-a915-f187d09e715b/life_cycle_theory_of_consumption.pdfIn PDF document text
    • https://72cee60b-533f-4fda-9f40-87b1bb6f0553.filesusr.com/ugd/590778_ad9386401b12414ea3c7b1f0509dcc48.pdf?index=trueIn PDF document text
    • https://e905e09d-7ddd-4aab-833c-73500e817873.filesusr.com/ugd/f4c08b_00a5238b102547359be3bac730a2535e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/takateg/ratexonobejokopududemin.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/type_of_computer_network.pdfIn PDF document text
    • https://46c19374-600d-43be-a5f2-d8bf07c6fddf.filesusr.com/ugd/cc94a4_8ac2f929db6d456b98e8a9712675d8f7.pdf?index=trueIn PDF document text
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_12e8d74d4f9b4751b475cce40105e2a9.pdf?index=trueIn 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_off0000f1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E2 5624 bytes
SHA-256: 80808d8ea3a68ac02f13ba007ecf2d0ae34517d3425cef058780ece491160ddb
font_01_sfnt_off00010510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10510 11124 bytes
SHA-256: fe59980197ac406b0916900fee8d163061d279a00d5654b6ab4969fc73e09dfb

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