Malicious PDF — malware analysis report

Static analysis result for SHA-256 20328dea69339619…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 07:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6d409860a136eaeee8e1ed894169d0f8 SHA-1: 0679fb4cb1910267d4c4a28e15791a59c5bbfd7a SHA-256: 20328dea69339619d33097231eb6ff366e14b5545a06734724ef757fffe5d763
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs and the structure of the PDF point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/6526c849caad4a9afe6bfb83b7f8d996/82608950517.pdf In PDF document text
    • http://studiocastigli.eu/userfiles/files/30867173746.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/gemojisokasasume.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/xutidaka.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/173b6e7ca9376772a9697748418c7fa6/32030750843.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/97685535684.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/90568768940.pdfIn PDF document text
    • http://benly-carson.com/product/files/95093510222.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/10117917392.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/52475994549.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/kinekifolozoki.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/koriligajomi.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/pusozevokolevu.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/fogadusigudadafov.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/72574763732.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/pemibin.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/95268903562.pdfIn PDF document text
    • https://suksesunited.com/contents/files/60240328110.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/jakonidixuxizamadi.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/8005198542.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/rubiginan.pdfIn PDF document text
    • http://vititanon.com/user_img/files/zuwozokavutorogir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=background+settings+androidPDF 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_off0000da75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA75 17148 bytes
SHA-256: 634f6e0d00133c02f51b3b993c06716c16b714fe72da0e15e78d15bdd1433d2d
font_01_sfnt_off000106cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE4 10744 bytes
SHA-256: 765c277bb73175f998487b001b5b56ab0a487a1c2fe26d9e1ae6f87e1ab2c257

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