Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b363c3468d184f8…

MALICIOUS

PDF

73.1 KB Created: 2021-03-07 00:57:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 82a86338feefd0736465cbd2ebf8a126 SHA-1: 552f6baba972efbb8e538184a8c3304620308c4e SHA-256: 3b363c3468d184f8129cab76427ea05fbb1a584fc43d000d0d1d7056f66e9161
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is part of a link farm designed to manipulate search engine results or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/wix?keyword=the+outsiders+chapter+5-6+answers PDF link annotation
    • http://sallehub.xyz/vugodutajovefameg75bkc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472479/normal_602498c996f30.pdfIn PDF document text
    • http://zokazurimila.mygamesonline.org/liwopejar.pdfIn PDF document text
    • http://help-service-support.com/cerebral_palsy_pronounce_in_hindiqtsql.pdfIn PDF document text
    • http://ejqy.com/3152500887o4s9u.pdfIn PDF document text
    • http://susurrus.space/vebetudi7x7oo.pdfIn PDF document text
    • http://help-business-media.com/finding_area_and_perimeter_of_irregu01eon.pdfIn PDF document text
    • http://qrastenmap.online/begugexorelod8xvxv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415937/normal_60350a091e1aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472216/normal_601e28a0e689c.pdfIn PDF document text
    • http://tramlaweq.online/331414878221c1ax.pdfIn PDF document text
    • http://kufowawixapiva.sportsontheweb.net/who_is_the_tempest_in_the_tempest.pdfIn PDF document text
    • http://idealica-italiaoficial.site/the_elephant_in_the_village_of_the_blind9cloy.pdfIn PDF document text
    • http://alsamcctv.com/ultrasound_guided_interscalene_block_sonosite5xs12.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gixarewujedel.atwebpages.com/povukadaxalakinelewut.pdfIn PDF document text
    • http://dumizalu.epizy.com/how_to_not_be_an_average_girl.pdfIn PDF document text
    • http://zefexulipovi.rf.gd/anganwadi_form_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/afterlight_apk_mod_full.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/hepatomegaly_causes.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/gotulajusirujibolipa.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_off0000e389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE389 5480 bytes
SHA-256: 31c908e7bd46868d9c182b292cf49a949907f61c604bbdb36b15e9e5abc007dc
font_01_sfnt_off0000f63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63E 9692 bytes
SHA-256: 2f325254a3eee17fb59930cc7d8825191fcdd2c3ead647ddda43297ddf1cb5eb

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