Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e10096b68d8822…

MALICIOUS

PDF

72.5 KB Created: 2021-03-12 04:09:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 00f764133bea0544d47ae1c3bbd593a1 SHA-1: a37cc33d3404eee49fb2c22247febcc3a612b05c SHA-256: a7e10096b68d88220ff7bc0e2ea2cbe3732451a2d5cc1e70d5bb27ab1131e09e
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, suggesting an attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using link farms on disposable hosting, further supporting a malicious intent.

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 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://jumiwimov.ru/award?keyword=introduction+myself+in+interview+pdf PDF link annotation
    • http://lovelyhouse.online/13629781225fba14.pdfIn PDF document text
    • http://tryse.xyz/jipedumira.pdfIn PDF document text
    • http://my-favshope.online/puwoxi6g8tp.pdfIn PDF document text
    • http://imkl-checker.com/29366812441z6ugw.pdfIn PDF document text
    • http://soldonlittleton.com/rasegokakefapuramofetobeeddxr.pdfIn PDF document text
    • http://cetapp.xyz/jasowuzujegilomafopitssm.pdfIn PDF document text
    • http://bigmagazin.xyz/how_fast_do_you_have_to_go_for_side_airbags_to_deployhdxpb.pdfIn PDF document text
    • http://itayoga.space/feral_movie_parents_guide875ud.pdfIn PDF document text
    • http://swiss-gear.shop/what_the_elephant_symbolizesax9vq.pdfIn PDF document text
    • http://pubgucbayim.com/scoop_it_up_minute_to_win_itmmqg8.pdfIn PDF document text
    • http://milanomodaitaly.site/ruzuba7u4i0.pdfIn PDF document text
    • http://uabiomanix.xyz/how_many_calories_in_dunkin_iced_matcha_latte0y04e.pdfIn PDF document text
    • http://letnesil.xyz/learn_to_read_latin_workbook_answers1mex9.pdfIn PDF document text
    • http://rezotu.xyz/7227216289246qd.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/91ed5a8e-6776-4668-a705-2db53bcd3d2e/poulenc_trio_for_oboe_bassoon_and_piano_program_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/blurred_background_for_android_application.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/cedar_log_table_and_chairs.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/movodivepagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2427ca6-b4e7-4182-8d9a-e19ff318bfb0/femesebig.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/xalazapababu.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_off0000e0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F2 5280 bytes
SHA-256: bfeeb69f8fee80a0fa0529441286b7cb65554537142351b1f167f76a29ddaed1
font_01_sfnt_off0000f2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F3 9896 bytes
SHA-256: 9c8f0f697cd935c9ae514d7299e6e860d6662be38d40b693e90e67f33ceefeec

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