Malicious PDF — malware analysis report

Static analysis result for SHA-256 b13eea23dc8b1783…

MALICIOUS

PDF

77.5 KB Created: 2021-04-03 02:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 026678fca6198728002540c7c3848150 SHA-1: 85ace025e19426a840212fc56828cdf536d03deb SHA-256: b13eea23dc8b1783f982bf919de456b52c29b1170bcf49cfe7ff0019c6aba671
156 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 0.9993

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://jottigo.ru/strik?utm_term=how+to+amend+taxes+1040x PDF link annotation
    • http://just-gopro.com/harassment_fear_of_violence_sentencing_guidelinesj5816.pdfIn PDF document text
    • https://cdn.sqhk.co/nujorazaje/didgiNa/birifezajerudebakun.pdfIn PDF document text
    • http://unlockdeals.shop/449838612063ivzh.pdfIn PDF document text
    • https://cdn.sqhk.co/nawakema/hjjdjei/mobile_strike_game.pdfIn PDF document text
    • http://zoomita.fun/606309368662jks9.pdfIn PDF document text
    • http://dayzcommunity.info/merrill_lynch_mortgage_phone_numberodk0q.pdfIn PDF document text
    • http://insta-sale.site/what_time_does_school_start_in_hillsborough_county_2019njtni.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/f3d70ba1-9965-4aba-8eae-f5b7eb3965c5/19912593007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85454a4c-2b92-4d76-8b09-3c22ba343a4e/2005_jeep_grand_cherokee_limited_5.7_hemi_tire_size.pdfIn PDF document text
    • https://97d49ff2-d914-4ae4-8ac8-5e5cf5f77cad.filesusr.com/ugd/6350c7_40f92e745b864d2987b2399e839ee9fe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vojapu/exercises_for_bad_back_and_hips.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b528f77a-a9dc-4a31-86a8-cad1b10db323/do_foot_peels_get_rid_of_calluses.pdfIn PDF document text
    • https://s3.amazonaws.com/tafogusegabomu/17784675869.pdfIn PDF document text
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_2d1f76e0e69e4e8aaeb9974d95a7c158.pdf?index=trueIn PDF document text
    • https://1a413096-4115-453c-84a6-e19f3d0a1e7a.filesusr.com/ugd/4a2d03_b15f9a9e22ee46c29ab3aa8b33079f92.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sevoga/wosulosipigivanoge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd9a0a75-d010-418d-9376-e56def9050b5/how_to_edit_existing_text_box_in_paint.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffa079db-ead6-4924-abda-8de1c90ffbf3/focusrite_scarlett_2i2_output_cable.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/how_many_calories_in_a_powerade_zero.pdfIn PDF document text
    • https://d75bbb92-b0e4-4b50-83e6-2443e695523b.filesusr.com/ugd/bc73b9_9de150e307954c8190c647f9174d244c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/legenapi/dell_precision_t7400_motherboard_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/the_heart_and_science_of_yoga.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/simon_companys_year-end_balance_sheets_follow._1_debt_and_equity_ratios.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_off0000f1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FD 5244 bytes
SHA-256: 34155cc069127bde19e16413926e55836b64fc2ef4ec8ef788f4d337f03fb1b2
font_01_sfnt_off000103dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DC 10744 bytes
SHA-256: f3bda4edbb44f2b37cca5ee9734f00460c84ae7b823f7f1dda4dadd29c0794d5

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