Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4e95123f5553910…

MALICIOUS

PDF

66.6 KB Created: 2020-11-13 11:34:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 3603700f4a4793251cb6dc72f40282eb SHA-1: c1968b58ba0c2f6fb0da8ae4b3ddfe2af412b48a SHA-256: e4e95123f555391038e854ed5da8fc3213198604b86db4b680795d219773655b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, contains text related to a schedule, likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/123?utm_term=st+lucie+mets+march+schedule PDF link annotation
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/9bcbecf63.pdfIn PDF document text
    • https://worobewunit.weebly.com/uploads/1/3/1/4/131406731/givus_vejebozawa_gajilujezo_vokopeni.pdfIn PDF document text
    • https://sazadasixitabe.weebly.com/uploads/1/3/4/4/134404720/b0405.pdfIn PDF document text
    • https://kidunaxu.weebly.com/uploads/1/3/1/4/131437100/gufegudipejabeko.pdfIn PDF document text
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/74e88eb3ff4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444874/normal_5f9f144ad14f2.pdfIn PDF document text
    • https://nikoxutaju.weebly.com/uploads/1/3/1/3/131378952/guwen.pdfIn PDF document text
    • https://kaxoleza.weebly.com/uploads/1/3/4/4/134453834/6750255.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/msc_mathematics_entrance_exam_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f9e4efd-c42a-41c6-810a-8269292a06b8/lumipareraforidipijugo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5f7eb23-7ed1-4625-9938-870058f2ef2d/as_coisas_selvagens_so_cita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c252fc7a-2cf4-4ade-a5e5-04e1895c8c11/viwebeporunudi.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/mapotojeruxaremifurugim.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_off0000c606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC606 5284 bytes
SHA-256: 02ac3bb49d47000eceb6e5da997d5ae2fb8d2162892a3737c408735e3af2f336
font_01_sfnt_off0000d7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C8 11344 bytes
SHA-256: 8a69ec9d0ccbf9f28860425f6e52a43d6f5dcb490917590e1fe0a45a3cf0e06b

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