Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a0077e539bbab1…

MALICIOUS

PDF

77.8 KB Created: 2021-02-27 18:25:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f0274b25e91e7316f93c698a9b40864b SHA-1: b55ece6a49e3a06ae0f0ff1f1a07e032ab68f49e SHA-256: e5a0077e539bbab17aab999b0852d4aa8adc5039aa6fca43c5237a90c5ae5a13
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document 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 https://seumenha.ru/123?utm_term=war+of+the+worlds+2020+ending+explained PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388280/normal_5fdbfaeecf24a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383340/normal_5ff6acde77230.pdfIn PDF document text
    • http://item-get.top/metodos_de_recoleccion_de_datos_cualitativos2vjkh.pdfIn PDF document text
    • https://jupagefux.weebly.com/uploads/1/3/1/3/131398252/gesetur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443588/normal_5fefa22b7a98b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371536/normal_602bf585e7b1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371261/normal_5fd7261cd54e8.pdfIn PDF document text
    • http://kostlike.site/poblacion_finita_e_infinita_y_muestr9ej0g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402481/normal_5fe80ab9d2441.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473938/normal_5fdeacdf77338.pdfIn PDF document text
    • http://donbetosstreettacos.com/42721018257zspo1.pdfIn PDF document text
    • http://bostpolamos.site/40480608364e64ha.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482625/normal_5ffa22cb541bf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jimomurapujivo.onlinewebshop.net/rikotimiguzenifidilinet.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/pedaleira_zoom_a2_para_violo_olx.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/xogewuluwaxegupuse.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_off0000f0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E8 5748 bytes
SHA-256: 67808b13da3d6c953e1060c1fdac80ba82fc35a3ec100f15f8fe055d38ad6c5e
font_01_sfnt_off0001049a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049A 11064 bytes
SHA-256: 909a5b7de5dbec939b3cb89f59aba628f2aeebf0ee153b8ec3264e411f534c04

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