Malicious PDF — malware analysis report

Static analysis result for SHA-256 410858f488ea2c39…

MALICIOUS

PDF

71.9 KB Created: 2021-04-17 20:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 039cab7f6eff716ea46891c2fd00008d SHA-1: c145ec54528dc76533c3984828f60bfbe15ee952 SHA-256: 410858f488ea2c391d824592208757d9667141f028e3b58af028aa1f018d0e6f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

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://leonvi.ru/strik?utm_term=what+happens+to+pecola+at+the+end+of+the+bluest+eye PDF link annotation
    • http://fuvagezilavez.mygamesonline.org/anomalias_cordon_umbilical.pdfIn PDF document text
    • http://sosiwawivijomo.scienceontheweb.net/infinix_note_4_x572_price_in_kenya.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426262/normal_5fd8caf5d2984.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489247/normal_6053ee420caa3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sefamuw.rf.gd/kuvuxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b5a43a7-a4e9-4694-a5ab-0b5cca84694d/sears_garage_door_opener_manual_41a4315-7d.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/el_s_de_las_nias_resumen_por_acto.pdfIn PDF document text
    • http://gugamofizuxeg.epizy.com/pet_safe_dog_collar_stopped_working.pdfIn PDF document text
    • http://zekazamu.rf.gd/fundamentals_of_molecular_virology_second_edition.pdfIn PDF document text
    • http://jerimopujokanar.epizy.com/bilanz_beispiel.pdfIn PDF document text
    • http://moxododokojuke.epizy.com/perforated_sheet_metal_suppliers_cape_town.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e00d29bd-9374-4230-b78a-f0333373b0db/poxemoba.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/wow_inscription_guide_bfa.pdfIn PDF document text
    • http://xotepugiz.rf.gd/13803191726.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA3 5404 bytes
SHA-256: 7d887c91091246af2ed77588246e2d0fdaa8faae78b518f20d71f781b06efbb8
font_01_sfnt_off0000ef14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF14 10508 bytes
SHA-256: 2566303b6a31a7029efcdbe9a9c6d3314f8c2f2d356eebbd03bb21feabbda3ee

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