Malicious PDF — malware analysis report

Static analysis result for SHA-256 9087bbc1a921e645…

MALICIOUS

PDF

91.9 KB Created: 2021-03-05 04:35:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 756163f6ba148798eb7be7f657276942 SHA-1: c9385b0ae7acb3215dde796ccf8f816c87c1f64c SHA-256: 9087bbc1a921e645a9253506303ce2a00f4e8d615005634217fc68fb15e80b7c
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/award?keyword=audiocodes+mp+114+firmware PDF link annotation
    • https://ninitirasaru.weebly.com/uploads/1/3/5/3/135317350/figaxasufusixiz.pdfIn PDF document text
    • http://joridasemif.22web.org/tuzasazikaxikofuteni.pdfIn PDF document text
    • http://kumululurug.scienceontheweb.net/pafor.pdfIn PDF document text
    • http://mumolazesinidix.getenjoyment.net/rajozonubo.pdfIn PDF document text
    • https://bobiputab.weebly.com/uploads/1/3/2/8/132814039/5322905.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479925/normal_5fda8153c1d14.pdfIn PDF document text
    • https://felojabok.weebly.com/uploads/1/3/0/7/130739263/7ffcb.pdfIn PDF document text
    • http://dovulup.iblogger.org/40060078083.pdfIn PDF document text
    • http://wojisub.mypressonline.com/pajozufeliluxufuwala.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418368/normal_5fd9698e8878d.pdfIn PDF document text
    • https://dijajogid.weebly.com/uploads/1/3/0/8/130874349/b3c74f50a56f3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418385/normal_5ff58bfdeb8ac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zatunikepozis.epizy.com/nofaxarojizibofugidada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc9f0ce6-ca27-4989-9652-f72c653a7e36/viewtv_at-163_remote_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9f52745-4c2d-4485-8e6d-499aeb308ab3/que_se_festeja_el_da_de_hoy_en_estados_unidos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01757f51-69fb-4115-b6dc-e71b2c089e13/how_to_use_pennsylvania_p-ebt_card.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3a50037-8c5d-4490-8037-d79d25f62cb2/how_to_adjust_pilot_light_on_williams_wall_heater.pdfIn PDF document text
    • http://miganuvag.myartsonline.com/wiat_iii_score_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f17a2c46-4d7b-48e1-8961-ddae65fd0fa4/56812456281.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_off000129cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CF 5488 bytes
SHA-256: 2f19b89bd557041dc43dd7819a98d11ed18d411fa6ea600ce4aad00d89730b60
font_01_sfnt_off00013c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C82 11536 bytes
SHA-256: 146a737e2ab16f3fbfdc3eaeff487be3e7616bf3f2fa6a76a157f21e52458167

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