Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad75f35ebf6060ff…

MALICIOUS

PDF

70.9 KB Created: 2021-04-06 08:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 71cedc1163b64b7b1b741ee4b57732bc SHA-1: e2b2dbb60209a83e3830845cd1bc9020039ae6cc SHA-256: ad75f35ebf6060ff581af20fe9c36288bbcc83fb482b1281da81639c9747d73e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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-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/wix?keyword=unblocked+games+27th PDF link annotation
    • http://rovejiko.22web.org/47122625588.pdfIn PDF document text
    • http://birodavaz.22web.org/46407226337.pdfIn PDF document text
    • http://viwimewi.22web.org/dopagipesawetid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6d23287f-a15b-43b7-8d69-700c0e01f504.filesusr.com/ugd/185c00_9a41a15e332b407a9f494b78ce399e7f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/77ea36fe-647b-4fd5-bb8a-51a28f89b33d/jilebad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/487fd442-9486-4289-949c-b69c505b5221/zopiv.pdfIn PDF document text
    • http://vobulag.rf.gd/kugamamazosifufo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2af9708-3d65-4ce4-affd-76960796e363/when_was_the_apocrypha_removed_from_the_king_james_bible.pdfIn PDF document text
    • https://ecab545c-19d2-4654-b6ac-fb8b9749f5ba.filesusr.com/ugd/e5412a_2b985b35e68b404aa87974b3879919f1.pdf?index=trueIn PDF document text
    • http://ledegov.epizy.com/articles_of_incorporation_canada.pdfIn PDF document text
    • http://jubusuboluxegab.epizy.com/treatment_of_mdr_tb.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/nonapanin.pdfIn PDF document text
    • http://dudufimapu.epizy.com/o_que_dizer_o_que_fazer_quando_ele_vem_aqui_cifra.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/auxin_adventitious_root_formation.pdfIn PDF document text
    • http://kudadurazeze.rf.gd/farmall_super_av.pdfIn PDF document text
    • http://diveruwafulebes.epizy.com/39877196332.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06b9c772-0015-4738-89b0-229f0296a6fd/how_do_i_fix_my_brother_printer.pdfIn PDF document text
    • https://083189c9-8220-4687-a375-57be19a37228.filesusr.com/ugd/909b15_db6e9013d8bc43c28703e7bcdb86064f.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_off0000d5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F1 5664 bytes
SHA-256: 427ae860c44817404750234b11cb6f82c93fca000b200e2011508d474d79ccbd
font_01_sfnt_off0000e91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91D 11084 bytes
SHA-256: a9b2f25ed16c2b92c71b3b11116315e4a9b452427753ea10de1776448b339aef

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