Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a57d34228e8876…

MALICIOUS

PDF

74.8 KB Created: 2021-06-08 02:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0b1171773bae7ab3e5ae3c2def7ed5b6 SHA-1: e384b60805c100d562bf7d92234ed8908d155d70 SHA-256: 79a57d34228e8876d9896baa08a79414c7eeca29ce3d52d55bc3675ee0ff031b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://queure.ru/pbw?utm_term=jandy+jxi+pool+heater+check+flow+set PDF link annotation
    • https://vowuzuvave.weebly.com/uploads/1/3/4/8/134884034/kisonefakobiv.pdfIn PDF document text
    • https://sizamuvexiluti.weebly.com/uploads/1/3/4/6/134644091/vorufefotefowexojo.pdfIn PDF document text
    • https://javodamujuwevef.weebly.com/uploads/1/3/4/4/134446411/7616704.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407331/normal_60356c0868938.pdfIn PDF document text
    • https://laxoweveludek.weebly.com/uploads/1/3/0/9/130970009/903a3.pdfIn PDF document text
    • https://revixapega.weebly.com/uploads/1/3/4/6/134619396/201758470d21.pdfIn PDF document text
    • https://ronewomiz.weebly.com/uploads/1/3/0/8/130874064/347128.pdfIn PDF document text
    • https://povaxabo.weebly.com/uploads/1/3/5/9/135976235/dutaxib_bodimed.pdfIn PDF document text
    • https://xizotikozuza.weebly.com/uploads/1/3/4/5/134587863/4a1e905cd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463529/normal_602783673e206.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464297/normal_6057d961c7cf7.pdfIn PDF document text
    • https://peranuzepaz.weebly.com/uploads/1/3/4/4/134459051/8dca3dbefa9af72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384159/normal_6032e2b505e19.pdfIn PDF document text
    • https://nodajalij.weebly.com/uploads/1/3/5/9/135990600/1dcb38.pdfIn PDF document text
    • https://wevubajapema.weebly.com/uploads/1/3/5/9/135958203/2650830.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472185/normal_6010a1532bb97.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a3bfaed-3496-4fbf-abfc-b3ef50112050/sozerawuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b762dc05-a4c7-4301-bff5-7ee2f6582521/mogevekibepor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07c9e86e-b4af-4d69-8bef-640c7f8edbd0/que_es_un_genero_literario_narrativo.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_off0000e40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40C 5636 bytes
SHA-256: 66ed0135535ff595d1a09bfa22a514b6bd47a170fad2b5e4a1f612af389d125d
font_01_sfnt_off0000f74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74E 11324 bytes
SHA-256: 0efb71302e8d143c68ea18528bb74eac7c45a49f5d185a0e98d7ff9eabb18a2f

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