Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8b0c70706d5f87…

MALICIOUS

PDF

80.8 KB Created: 2021-03-22 21:17:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 316d42ee80ade0491b763a7b8ae7cc18 SHA-1: 40681994c35cf5d9be71f63b8bbe914049804e99 SHA-256: 8f8b0c70706d5f872e32914e2110f95eb8d4f2e2d199375b76440b68d4604d3e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm designed for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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.
  • 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://vilenefex.ru/123?utm_term=injury+report+rams+chiefs PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404983/normal_60065f9f1ee9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388285/normal_60388a8537745.pdfIn PDF document text
    • http://rusedewafizurap.66ghz.com/ableton_free_windows_7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375884/normal_5feb58787b7bf.pdfIn PDF document text
    • http://wofaguwere.iblogger.org/16588368839.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://uploads.strikinglycdn.com/files/8c748575-bbbf-4547-afa0-5406d2842760/97387911764.pdfIn PDF document text
    • https://590703a0-be71-4d3c-a49f-17767d5969ef.filesusr.com/ugd/656c20_789ed855f2f74b43b47810378ccc1264.pdf?index=trueIn PDF document text
    • http://tosuniwenalob.epizy.com/annual_report_of_reliance_industries_limited_2020_17.pdfIn PDF document text
    • https://5c09c65f-4728-49e3-9562-8692e696fc4f.filesusr.com/ugd/32acb1_622ec096dec545139c49d2766edc6ec5.pdf?index=trueIn PDF document text
    • http://libejejizu.epizy.com/ranuxerotalemavuwa.pdfIn PDF document text
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_e84c7007ad644db9a54c0ac46882c575.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/68281594-698d-4191-93c5-dc9345f7a48f/what_does_the_bible_say_about_spreading_the_good_news.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e7e024e-c5cb-4b1e-ace0-c2780ed74699/what_is_the_story_thank_you_maam_about.pdfIn PDF document text
    • http://gidovofivoj.epizy.com/wing_chun_basic_techniques.pdfIn PDF document text
    • http://womusosixedel.epizy.com/66150692523.pdfIn PDF document text
    • https://8e0cabef-d481-4215-b437-8a5fc4e4723c.filesusr.com/ugd/f41140_5f608a1bc6884f2ab9db0f72c0cf7369.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/97bd8eaa-4156-473c-88e6-e17e4dfce961/32365797495.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c2ed501-f132-4064-9c14-de82d4893014/61822289820.pdfIn PDF document text
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_9aacb5afd456458c9dee5e1b3cf4d995.pdf?index=trueIn PDF document text
    • http://zebofazedixa.rf.gd/23626690683.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d30946f2-3deb-4200-bf7c-d8bf361b7b12/how_does_the_son_of_neptune_end.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26e60055-67aa-4893-a5ef-3d18451c2bbe/nanobobabegibalugipebi.pdfIn PDF document text
    • http://sejigesenevemi.epizy.com/crime_report_my_area.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e3ae321-7870-4c52-b219-c124e311d494/is_the_covid_test_free_in_texas.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14B 5220 bytes
SHA-256: b91fcf7d28207c84080f1ddae003ca09cb2607035910242e6a53542ff236078e
font_01_sfnt_off000102e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E7 10696 bytes
SHA-256: fe7739915656a9b1928320bd3cd259575f7b2728fc3889d100c42f9274a70098
font_02_sfnt_off00012748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12748 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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