Malicious PDF — malware analysis report

Static analysis result for SHA-256 34cac59b4d5150da…

MALICIOUS

PDF

74.9 KB Created: 2021-09-19 04:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d9c904c78fb14e57e846e96c32ffadcc SHA-1: f9080f41f73b53256af98d2e047fec68de902143 SHA-256: 34cac59b4d5150da71d5b63a71bd508b7e15c74c31b83c896c470176ee53f693
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used as a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://allytemp.ru/uplcv?utm_term=vidmate+app+2010 PDF link annotation
    • http://dienlanhtruongson.com/upload/files/keremowiremoxijixetune.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/naxosuj.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/lipuropedofidame.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/vegelawarebopiwuwexa.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/pabadufunuputoda.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7a94cdda0---29210029546.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/bamazejisisaleze.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/82009753924.pdfIn PDF document text
    • https://ratosatu.com/contents/files/rubobogelalebetoka.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/ripusatam.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/xobevaxareganewugoduxemeg.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210914_C918EFB69B6FB6F2.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/21908331393.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/nawemefi.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/96444776569.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/24795986639.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-6/20210906213236221908.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/63994980671.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/52897965666.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/62900144279.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/lotaj.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/32989889612.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16143caa12ab06---87518752652.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AD 16984 bytes
SHA-256: b478c8317968c7812fb0f61879575fe03d5ef09269e0303e4e1e0adf57a33836
font_01_sfnt_off0000eead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAD 10276 bytes
SHA-256: 08ebb1f5377c081b293a00f19dc4a2cbeff3aba6daec3e14cc95a0e6a2c50f2b
font_02_sfnt_off000105e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1