Malicious PDF — malware analysis report

Static analysis result for SHA-256 658518c6f72f5b5b…

MALICIOUS

PDF

83.6 KB Created: 2021-09-04 11:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ae2f9c6188163cc523a73504d60febf4 SHA-1: c9f2c7a0e04eba0d60b2efd5b880468f0994cc4d SHA-256: 658518c6f72f5b5bf4f6f7ef12b8f5d4319791267eda05986415e45424223361
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://silverwayshipping.com/userfiles/file/85970308626.pdf In PDF document text
    • http://dientrotiendathc.com/media/ftp/file/11174767436.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/dexaruleve.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/puwivuxetajiziwerer.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/10519066637.pdfIn PDF document text
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/30161639039.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/xivefifa.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/10836131346.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/47239656430.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/53330405587.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/monijanutaf.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210701182439143.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/lifavewejigugisenubu.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/26744347797.pdfIn PDF document text
    • http://skyparadisecoffin.com/images/media/files/65713806518.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/bakadetadoruleri.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/34131085814.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/59174582143.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/sovubirarifarezeze.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/73215348142.pdfIn PDF document text
    • http://www.asslar.de/downloads/98899194403.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/73384950861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=latitude+3490+spec+sheet+pdfPDF link annotation
    • 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_off0000d340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD340 10944 bytes
SHA-256: ef766dc2060e567a8c459f0c7650a8a6645b4a7c8443381cb34b69491f86f5e5
font_01_sfnt_off0000ecd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E7 23220 bytes
SHA-256: 7dc7fd0174749cf09786b559de5048dec79727afa4265514bbaf01c635cbdf9e

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