Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a79392dc2696241…

MALICIOUS

PDF

76.6 KB Created: 2021-03-16 10:52:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4b9b4180fd0266f3c4b25f60fa5ad45b SHA-1: 16e8496cb89ace7d7517813d0f976c3a159c2714 SHA-256: 9a79392dc269624183949fde3f3c0d4e79ba90948cf47d277a1394c79ca11761
186 Risk Score

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 0.9956

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://maypoin.ru/123?utm_term=high+hopes+piano+sheet+music+patd PDF link annotation
    • https://koxowuberes.weebly.com/uploads/1/3/1/3/131379375/relujigadavidugovalu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489730/normal_6044cb9152e8d.pdfIn PDF document text
    • http://polobasopika.mywebcommunity.org/jemubadu.pdfIn PDF document text
    • https://bimozasobo.weebly.com/uploads/1/3/1/3/131398313/babepexumex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402481/normal_5fd03af5cae5b.pdfIn PDF document text
    • http://posadukik.getenjoyment.net/29198338664.pdfIn PDF document text
    • https://wavenugila.weebly.com/uploads/1/3/4/8/134852162/cf8cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384647/normal_5ffabe24edb8d.pdfIn PDF document text
    • http://gejudoxe.mypressonline.com/causes_of_type_2_diabetes_mellitus.pdfIn PDF document text
    • https://gobujapupi.weebly.com/uploads/1/3/4/7/134725152/7c60f.pdfIn PDF document text
    • http://fivadoguna.medianewsonline.com/voduvewapelubija.pdfIn PDF document text
    • http://beduzevitugok.mypressonline.com/gufamen.pdfIn PDF document text
    • http://rixujewo.getenjoyment.net/8247369633.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450625/normal_602017f57364a.pdfIn PDF document text
    • https://paporese.weebly.com/uploads/1/3/1/0/131071113/2488e2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e0fa0743-814d-41de-b6a5-47f787911882.filesusr.com/ugd/89d2ef_8441cb936d4a466fbb6946cfabc3b6d1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1305b90d-294a-44ee-929f-557323592c78/regokodadulesabofoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff643c4c-4e09-4cd3-83b8-03c6d34f2871/90082089024.pdfIn PDF document text
    • https://147762ec-90f0-4523-8579-43cb3cd17c82.filesusr.com/ugd/6c48b9_0edd3f5a7f7d4200aa7356d548ff8529.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/952a9e48-63e3-4aa3-a016-a32fb19ea061/waladurikovusawigegafo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05067b89-da28-441e-be54-b852d4a0dd6d/86503698678.pdfIn PDF document text
    • http://tevefetilojas.atwebpages.com/2002_ford_explorer_4.0l_engine_diagram.pdfIn PDF document text
    • https://8c4778c4-ed17-4cf1-86f9-5448e21c5c15.filesusr.com/ugd/6da380_26f0adfa035441eab492029cb75d1687.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1ab40f8-1a8b-4054-864d-17ad8c55c841/shimano_di2_charger_user_manual.pdfIn PDF document text
    • http://jatoxat.atwebpages.com/how_to_connect_sony_camera_with_iphone.pdfIn PDF document text
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_a66e6bc985e64835880d66fb8a58f2b8.pdf?index=trueIn 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_off0000ed3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3A 5320 bytes
SHA-256: 84e0343806d1a9822c98465977f079e1913c1ae474b7b73872fb2fcf2ae8003d
font_01_sfnt_off0000ff32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF32 10844 bytes
SHA-256: 445e41595852d8c5ac8e4b0ed7619eb54f48597b6ef700725ee4f299ea622b1f