Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1412a9159357759…

MALICIOUS

PDF

68.9 KB Created: 2021-03-27 16:05:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 687824b24202991c20377833929ff8dd SHA-1: 4c4cd3f286fb75b84af1c1138c0a64803da72ba7 SHA-256: a1412a915935775958b4e5090a98956929f6b73a90b34f58c26f4e4dd624f6eb
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous external links pointing to various domains, including suspicious ones like 'reduslim-italy.site'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful content.

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 http://reduslim-italy.site/wibemenekycc1g.pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4449603/normal_5fca21b2158ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377128/normal_60199ca9f0226.pdfIn PDF document text
    • https://jizidetaji.weebly.com/uploads/1/3/4/6/134626841/kibekileju.pdfIn PDF document text
    • https://cdn.sqhk.co/zifalulog/dhdehfy/dexifij.pdfIn PDF document text
    • https://cdn.sqhk.co/riroxale/dDzNVnJ/95667542291.pdfIn PDF document text
    • https://cdn.sqhk.co/subetudagoli/cp1Tha8/kakafajuwogufawogadefatu.pdfIn PDF document text
    • https://cdn.sqhk.co/tenotitur/hilxbig/zenusaroxepozadusim.pdfIn PDF document text
    • https://sujibovuf.weebly.com/uploads/1/3/4/7/134705076/gusiru-vezes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392869/normal_6003e9fcc60ed.pdfIn PDF document text
    • http://123dutch.com/1991_s10_starter_wiring_diagramjmv1m.pdfIn PDF document text
    • https://cdn.sqhk.co/fevivesuxofo/2ic4jiR/serie_a_top_scorer_19_20_season.pdfIn PDF document text
    • https://fenagedel.weebly.com/uploads/1/3/4/3/134316540/f0d8dbcafc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/wb/ENAH/~3/Xr6F2PkPTcg/wb?keyword=skyjack%20boom%20lift%20partsPDF link annotation
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_abb06cc8d77f43b89aa0dbf531783f89.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc2b3626-5277-4b20-9353-5b4b8398fb9b/zobuxixobo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59923893-20c3-49a2-b6e7-d54474aa379a/dogusajanokuzunebumuso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dc8fba1-3561-4c62-885a-1e57b38d217f/cateye_strada_wireless_cc-rd300w_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72e889d9-d436-4aa8-af12-6a61ddc8fd22/vasar.pdfIn PDF document text
    • https://81da36f4-dec6-4bf4-836b-19ed67500659.filesusr.com/ugd/5fd5c1_daee22be376c4cda8154b93a654b5108.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_off0000cfd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD1 5648 bytes
SHA-256: 356a697b7fb29c762f238889b562292e5171c6019a3171191b3657279a75b443
font_01_sfnt_off0000e301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE301 10472 bytes
SHA-256: f241c238062d596d1c87d74e2d3ad080153245305a1a6c41d9ffe7aa82ef24d6