Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f23fc180baf92bb…

MALICIOUS

PDF

75.7 KB Created: 2021-04-05 16:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: de83b3db8fdee753462923af9f8b116a SHA-1: da60b70d75a080f15b4af83a4726232e18d9b1ae SHA-256: 7f23fc180baf92bbad04107b1580b5f6ef4e77bd61e4db1ea4072095396477fa
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious websites or potentially download further payloads. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

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://gimoguvi.ru/award?keyword=sony+a6000+camera+manual+pdf PDF link annotation
    • https://jewafime.weebly.com/uploads/1/3/2/6/132681773/3943145.pdfIn PDF document text
    • http://kimuzufar.22web.org/senior_graphic_design_jobs_atlanta.pdfIn PDF document text
    • https://fitulepam.weebly.com/uploads/1/3/0/8/130874207/3538065.pdfIn PDF document text
    • http://bunagutafa.getenjoyment.net/solidworks_projects_for_students.pdfIn PDF document text
    • https://dunelakanova.weebly.com/uploads/1/3/1/4/131410870/e20a84edd.pdfIn PDF document text
    • http://ketotreno.buzz/deschutes_river_fishing_guide67njl.pdfIn PDF document text
    • http://rexonina.medianewsonline.com/satelubilebidosafedavaze.pdfIn PDF document text
    • http://vehicleinsusa.com/how_do_you_use_a_brim_espresso_machinen0djx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9d03b195-5c34-4993-8a23-519dd2bddccd.filesusr.com/ugd/9ac058_4f7c49a1fa3d4d65934fb1b99a11dff9.pdf?index=trueIn PDF document text
    • http://zozasozam.epizy.com/kagulewabususomobosefox.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/42628037126.pdfIn PDF document text
    • https://f87ce62f-3d5d-4c42-bff3-2e7d00444551.filesusr.com/ugd/72ed28_475970718ad848c199fa9c902e3cd472.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/96006048669.pdfIn PDF document text
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_20855f574ffa4dfbbfe978e03dc356c2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gedimuta/dating_scan_at_6-7_weeks.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_off0000e8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DE 5624 bytes
SHA-256: 9d794314aee2aa5271b93841cac07b85ff06d9931daef15b910f80df321d1676
font_01_sfnt_off0000fbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF4 11216 bytes
SHA-256: 2c06067066446d6f9c9c7a7a3f5185d3a047d18335f56803e344002d7e073ce0

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