Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac3dbd70b3871604…

MALICIOUS

PDF

76.9 KB Created: 2021-03-06 12:36:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: fc154c50ff2ca963cdc225226ab8a728 SHA-1: c4883a244a2c8cc85d599ed04a0c8d3188ff0562 SHA-256: ac3dbd70b3871604c7b15282b9cc816a8cdc71ec114e2d7208f54908546b3118
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate the document's purpose is to redirect users to potentially harmful websites.

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://resalured.ru/wix?keyword=frog+dissection+analysis+questions+answers PDF link annotation
    • http://itrom.fun/honda_gx340_parts_list6qhkb.pdfIn PDF document text
    • http://xukiwowarenop.22web.org/what_are_the_different_writing_structures.pdfIn PDF document text
    • http://cocobeautybar.ca/615935932922rrd3.pdfIn PDF document text
    • http://winfreeiphone.xyz/8155930777g3pnb.pdfIn PDF document text
    • http://texno3ua.com/64286408650vpmkf.pdfIn PDF document text
    • http://zathkatow.xyz/cbse_net_application_form_for_december_2018aejzq.pdfIn PDF document text
    • http://tiktokfrance.fun/savarp20ej.pdfIn PDF document text
    • http://tujozavido.66ghz.com/fugasekagofakexonexuzej.pdfIn PDF document text
    • http://idealicaitalia.website/25133422968ifoqi.pdfIn PDF document text
    • http://debesur.iblogger.org/best_online_sat_practice.pdfIn PDF document text
    • http://azalea.store/juki_ddl_555_reviewullmw.pdfIn PDF document text
    • http://hookup750.website/amarilli_mia_bella_tenoryaob4.pdfIn PDF document text
    • http://momsmall.space/abbe_refractometer_working_principlei30n1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_f663ab21107a45c5a3941b6eb9664a0e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/tutene.pdfIn PDF document text
    • http://tesepesizaz.rf.gd/37877407555.pdfIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_88811ef2bd124b989a1ac81f8ccd1190.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jadere/vavoxisilotafepis.pdfIn PDF document text
    • https://4b002d3c-a55f-42ce-816c-238f848e88a9.filesusr.com/ugd/3398cc_1294afbb116f400aab4059ccbe2c97e1.pdf?index=trueIn PDF document text
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_ebc63da0bb80448cb9f40455b3de1ebc.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_off0000f138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF138 5384 bytes
SHA-256: 9829b8d07466891e8bf232913954de14abfa27d95009aada9c0aafba01dc3278
font_01_sfnt_off000103ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AD 10136 bytes
SHA-256: cc7609203b8e9ea4281110718e2aa522eb04aef8d2b000ec3732f534443509f1

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