Malicious PDF — malware analysis report

Static analysis result for SHA-256 b855d1220c0e923b…

MALICIOUS

PDF

73.5 KB Created: 2021-04-01 04:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 533ee6c100dbdc3de1196400c8aae6a7 SHA-1: cc67c5b24ef5ab7915028c8a8c524fbaf4544241 SHA-256: b855d1220c0e923b808376c3f3573fb1c7d4d8cc534aad5b4c3de6dfe65a1eae
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 0.9995

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://dafemum.ru/wix?keyword=aquabot+pura+4x+manual PDF link annotation
    • http://remont-kholodilnikov.website/54817949557791wl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452862/normal_5ff09af5c715c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406208/normal_6006eb400af61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369499/normal_6064e66bd489d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420752/normal_5fc98dda0b074.pdfIn PDF document text
    • http://wigojomet.22web.org/what_was_the_second_great_awakening_caused_by.pdfIn PDF document text
    • http://pokemonrivals.online/begejizusozuzi0natj.pdfIn PDF document text
    • http://moxegagiku.22web.org/22387482581.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://c07b3cb0-7d4a-4e65-9c62-eb3bd0ce3b6b.filesusr.com/ugd/7560d5_985d81cc7ac34d6396ca00fac070598d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/02ae0fab-9b77-45d1-a3a5-22a1e674bc5e/59898579886.pdfIn PDF document text
    • https://d12e84a0-9808-45da-82c6-613dfe540d1b.filesusr.com/ugd/dc8a8e_0855360bc6454fa7a725a78a86d40fe5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5845097b-50d7-4c7f-838a-0b0095f326e8/dungeons_and_dragons_5e_starter_set_rulebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/449e8312-5065-4807-89ce-8d01323fc5fc/gramatica_espaola_para_extranjeros_gratis.pdfIn PDF document text
    • https://4c982f7a-b72b-446d-8c7a-5e2d6818c0db.filesusr.com/ugd/519a61_e33fd05456bb4ecfb8afad30e91d172d.pdf?index=trueIn PDF document text
    • https://1e438cd7-6f3b-42ac-a97b-d13a75fa135b.filesusr.com/ugd/0c268c_3aedc3673d9049a9bcd03190b49fd22e.pdf?index=trueIn PDF document text
    • https://69f6cc44-9198-4e41-bafa-43503dba92bf.filesusr.com/ugd/dec231_1fe7c7dc04ec42cca338373b0a88b675.pdf?index=trueIn PDF document text
    • http://tubujaj.epizy.com/anatomie_du_systeme_urinaire.pdfIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_9cdd216253a245c089c0c1f2fea532f9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/134495c9-7944-4c37-8edb-54b04354a20a/74432072040.pdfIn PDF document text
    • https://46fb9a51-9e16-4ad8-811e-2f7ed01702f7.filesusr.com/ugd/53363c_e2a0319d8f934934832cb07cba1e38aa.pdf?index=trueIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_c8ddd29c8c294e9ea8c35356d22b9c26.pdf?index=trueIn PDF document text
    • https://b5c90759-dbf8-4ccd-b12d-e23c958527f9.filesusr.com/ugd/915a55_d446631ba0fd40b692953648ba2dd309.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD399 4916 bytes
SHA-256: b1f15939b8819e02b971b8d73b4e71ebfe39300ddb2fa36dad3f3414eebbf7fd
font_01_sfnt_off0000e431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE431 11232 bytes
SHA-256: 3b7541cc441e33136cf8a77eaad48b30856e978aad80a355d457c486477e7c0b
font_02_sfnt_off00010a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9C 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2