Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1ac700078748c2c…

MALICIOUS

PDF

78.2 KB Created: 2021-06-11 23:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b3e8741dd58ab962b1083c7fe965b309 SHA-1: 16c33f4071d1c83269f777924b1030d4bbb6e51a SHA-256: d1ac700078748c2cdd49dac76dba1e65d5d1f322f256040121bbe36d0ee5a957
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. It contains an embedded URL pointing to 'nomylo.ru', which is likely used to host malicious content or phishing pages. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to host numerous links, further supporting a phishing or malware distribution motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nomylo.ru/pbw?utm_term=jai+pubg+ji+wala+gana PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465548/normal_605242c814a52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460944/normal_60641cda7183a.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4467586/normal_60afe51e24187.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/a7a0e9fa-64d1-439d-a84b-779f52334f13/gejigarisuzatugelolawoka.pdfIn PDF document text
    • http://xifatarege.pbworks.com/w/file/fetch/144951507/lofipezaluz.pdfIn PDF document text
    • http://waxijoruv.pbworks.com/f/sosigowinoxixapetip.pdfIn PDF document text
    • http://zuxanoguk.pbworks.com/w/file/fetch/144707433/electrostatics_sample_problems_with_solutions.pdfIn PDF document text
    • http://vawijoj.pbworks.com/w/file/fetch/144732780/how_do_i_get_my_onn_wireless_mouse_to_work.pdfIn PDF document text
    • http://mepijewaj.pbworks.com/f/79132266003.pdfIn PDF document text
    • http://xizisimavi.pbworks.com/w/file/fetch/144542505/92959207868.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1cdf56d-9fec-4762-a103-1f723db92766/46088757934.pdfIn PDF document text
    • http://dijakezepo.pbworks.com/f/siwigoto.pdfIn PDF document text
    • http://gabekujijud.pbworks.com/f/robux_to_pesos_converter.pdfIn PDF document text
    • http://morabef.pbworks.com/w/file/fetch/144672879/how_to_hack_nitro_type_2020.pdfIn PDF document text
    • http://ziriwuru.pbworks.com/w/file/fetch/144746991/giraregegoriniledutilaman.pdfIn PDF document text
    • http://nafidob.pbworks.com/f/43986406424.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f256774-df2f-4f0f-93db-04da6969c519/dezoz.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FF 5896 bytes
SHA-256: dbfa69d683ab05facfd5a762ad0792398497fd107ad9386d990523c69ffc989e
font_01_sfnt_off0000e85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85F 5008 bytes
SHA-256: eb4b0e15d5597fbe64b8fb9b8dc97fcf66acf20cfa933cb1bee7fdf25c349620
font_02_sfnt_off0000f98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98C 2984 bytes
SHA-256: 21974688707d5a868dc57c3e660a700972cef5e6e42d269fe6edd6f9a1f41486
font_03_sfnt_off0001065d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065D 10888 bytes
SHA-256: 1f60c865ea5e827aa62748e9a9d1b8e095853ca4526d3f2fea4eeda24e971d0c

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