Malicious PDF — malware analysis report

Static analysis result for SHA-256 5287729e93c9af01…

MALICIOUS

PDF

83.8 KB Created: 2021-03-26 09:46:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 78bd9d00e52afad739bdf3736b8b83be SHA-1: c079055ff91b1208d09c8dc13fdf80f05dfb78b9 SHA-256: 5287729e93c9af013d9320f08eaf25cb2595dea9581ec168439994ae8db18a3c
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to disposable domains and one specifically identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://druttle.ru/123?utm_term=icebreaker+interview+questions+and+answers PDF link annotation
    • http://gixodugesu.medianewsonline.com/1155795219.pdfIn PDF document text
    • http://xeberok.getenjoyment.net/56746284131.pdfIn PDF document text
    • http://jebebixazonutug.mypressonline.com/xerapifajegijuro.pdfIn PDF document text
    • http://copyrightnotices-form.com/fovodututibuwozuq9yz.pdfIn PDF document text
    • http://japamawosoj.mygamesonline.org/adjetivos_para_describir_personas_en_frances.pdfIn PDF document text
    • http://xejopegig.mypressonline.com/fusionner_fichier_en_un_seul.pdfIn PDF document text
    • http://xagugudel.sportsontheweb.net/around_the_world_in_60_seconds_book.pdfIn PDF document text
    • http://firstreadersclub.com/kivisevuromorifasowoggxj15.pdfIn PDF document text
    • http://mestikon.online/wegotpnfex.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/ac8a1ffe-553a-427f-beb2-335c6b8eda66/grohe_faucet_parts_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1c97e02-bfb3-40aa-a882-fcd5e15388ef/surely_youre_joking_mr_feynman_audiobook.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/maplestory_come_find_me_cheat_sheet.pdfIn PDF document text
    • https://29fa80ab-3b21-46a5-a5c9-66d7a3d84e9c.filesusr.com/ugd/eb9fb8_b330e449d2ea4a0a88656733d810ffda.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sesijesule/cash_luna_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be0691c3-c14f-4ab3-8101-88799c1374d1/balid.pdfIn PDF document text
    • http://xijewixevav.onlinewebshop.net/55403951409.pdfIn PDF document text
    • https://c3e810f9-371e-40b9-9a0b-4695a496ec77.filesusr.com/ugd/2c7c49_96d020a5fc6d4d7ca483e17130e14592.pdf?index=trueIn PDF document text
    • http://wopojofa.atwebpages.com/4250317240.pdfIn PDF document text
    • http://kigokigaruv.myartsonline.com/barcelona_bus_turistic_route_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d271e17b-e5e8-4bc7-aee9-c6fa01e5482d/12732452924.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1af43486-6c01-4532-a120-c734e0cddfd5/differences_between_evolutionary_and_revolutionary_new_products.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/how_to_fix_pressure_washer_wand.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/sujiku.pdfIn PDF document text
    • https://b24182fa-1fee-416c-9f57-41d8a36573e1.filesusr.com/ugd/1cc367_d3eed3b483264a50bda0cbd9c7e8f6fc.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_off00010c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C60 5320 bytes
SHA-256: 5271702cd83b24d175d41998587df995751d3832f49e86b6682c14f16fd96622
font_01_sfnt_off00011e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E95 10636 bytes
SHA-256: c684529efbb1c2e54e71c7ac2036296f86ce18e61ec577912ab34a184e46fdd3