Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dfea0d66c96fb67…

MALICIOUS

PDF

79.3 KB Created: 2021-03-16 07:53:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e01b48e78d627197bbb06dc69027d125 SHA-1: 57e90d596ff421a7dc2401c8e5c95414973ed2e0 SHA-256: 7dfea0d66c96fb674a68ca178b17693ba6310c39588c9838e081ab335be57bee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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 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://jottigo.ru/aws?utm_term=how+do+you+play+baseball+in+darts PDF link annotation
    • http://moxawunanenubop.sportsontheweb.net/dakisovaravisudokob.pdfIn PDF document text
    • http://pokezokebawi.mygamesonline.org/42218059333.pdfIn PDF document text
    • http://klyshsheff.xyz/memobopitogegifokejidalnsu8.pdfIn PDF document text
    • http://tifubuza.22web.org/wnyc_app_android.pdfIn PDF document text
    • http://tewatag.medianewsonline.com/37392173485.pdfIn PDF document text
    • http://dvigatel.guru/how_to_twitch_prime_subscribe_on_iphoneo3e1k.pdfIn PDF document text
    • http://toolsbestpricemicrometer.site/wusatigepenajonelavidexik5fkd4.pdfIn PDF document text
    • http://my-favshopf.online/orbit_sprinkler_controller_installation8knsv.pdfIn PDF document text
    • http://nopotaz.medianewsonline.com/86910871902.pdfIn PDF document text
    • http://tibudirowe.mygamesonline.org/excel_vba_select_last_cell_in_row_with_data.pdfIn PDF document text
    • http://vilopeg.xyz/bararenajon6fwh.pdfIn PDF document text
    • http://nijewogifuzazi.mypressonline.com/how_to_get_rid_of_acne_on_forehead_home_remedies.pdfIn PDF document text
    • http://sovetnik53.ru/clicker_heroes_codes_for_rubiesxvkzs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zamoguwudegovo.rf.gd/cuantos_kilos_tiene_un_metro_cubico_de_arena.pdfIn PDF document text
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_7b881071a92b4f3682a032c92d7c2fac.pdf?index=trueIn PDF document text
    • http://zedaziwubisod.rf.gd/facebook_lite_9apps_for_pc.pdfIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_b9ac2ab4edeb4654a8408600c3a84b22.pdf?index=trueIn PDF document text
    • http://pesafitibum.epizy.com/48157986553.pdfIn PDF document text
    • https://cb70cc59-2297-49c3-b7e2-2ac7e26e28d4.filesusr.com/ugd/4479ed_ed13edd57f1d48848923b1a8a842239b.pdf?index=trueIn PDF document text
    • http://watusatuvor.myartsonline.com/duxojiradasor.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_off0000f9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BA 5248 bytes
SHA-256: ddeb8cd2550f114f54b7c22af9aef9b4bdde6b2630a4f5b945e767ade6fe40b7
font_01_sfnt_off00010ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA7 10716 bytes
SHA-256: cbed79952d69e69e4c2b6377ab2c06ce5a1b7ae0f5732e006548c7113a615b74

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