Malicious PDF — malware analysis report

Static analysis result for SHA-256 b68aca20006e35d2…

MALICIOUS

PDF

157.6 KB Created: 2021-04-07 17:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1136d710a340e7db44dd24e4c9e9b5f0 SHA-1: b01ce07451fcc3811610f0897822d8fd375e3687 SHA-256: b68aca20006e35d2f16c433b8fe2a8aadea110a0ee7fbc7e15fd417fcbe7ce13
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration of them pointing to disposable hosting and employing UTM parameters, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are sufficient to infer a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://mezovuduw.ru/strik?utm_term=reznor+udap+heater+manual PDF link annotation
    • http://excschool.ru/present_tense_verbs_worksheets_4th_grade1fdse.pdfIn PDF document text
    • http://ditoterelutas.sportsontheweb.net/ignou_admission_2020_20.pdfIn PDF document text
    • http://smcjd.com/rudupefvbkoy.pdfIn PDF document text
    • http://alternativeinfluencenetwork.net/49096234401z2bv1.pdfIn PDF document text
    • http://penageli.getenjoyment.net/viwafowidamagurabar.pdfIn PDF document text
    • http://feyakast.online/which_one_is_worse_a_psychopath_or_sociopath1d03h.pdfIn PDF document text
    • http://copyrightnotices-form.com/easy_birthday_cake_recipes_for_dogs6gcwh.pdfIn PDF document text
    • http://znohist.site/alpine_cda-9883_bluetooth_setupwdb9c.pdfIn PDF document text
    • http://fruitnaturs.space/989905235763h76z.pdfIn PDF document text
    • http://ellmax-site.xyz/z_for_zachariah_book_filmgtqi0.pdfIn PDF document text
    • http://avlto.best/rewokadeponobowipanumi69rdj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xutenujute.myartsonline.com/toeic_speaking_actual_test.pdfIn PDF document text
    • http://wavexijazibivat.myartsonline.com/annotate_windows_open_source.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/kinukefiwulamotujo.pdfIn PDF document text
    • http://roporuti.onlinewebshop.net/mpumalanga_bursary_application_form_2020.pdfIn PDF document text
    • https://e5eb5b25-b33c-43e3-82d5-57ab1bf863d8.filesusr.com/ugd/b0c717_24e2ad3109444d45879a7237a403956a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/96835596213.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69c627f9-be7e-46c6-ab7a-5f9aae051a2a/30039905952.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/cisco_sg300-10pp_power_adapter.pdfIn PDF document text
    • https://3064a0a7-8496-4b95-be1e-56094aee372f.filesusr.com/ugd/0cf4b9_346163da7c914b5a9b6d39046998c7bf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/afa14b9f-a172-46fb-a8c2-5ac1bef0edb2/51632706167.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/wifotegepurosawo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00022b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22B7C 5080 bytes
SHA-256: 886a33f8ecdb07ac104c08f85071f33d15deacc2d808d1a289e261696ec9fcb8
font_01_sfnt_off00023ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23CA3 13060 bytes
SHA-256: b01910c1d735b7965ee109895515d293ab02e5faa1f01ca42a896bea4f164636

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