Malicious PDF — malware analysis report

Static analysis result for SHA-256 f078e5517f50a306…

MALICIOUS

PDF

82.6 KB Created: 2021-09-12 02:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f434dd75b108ed7894edac8ee22dd048 SHA-1: f9e7b5adc07c4272f5f62791e54c7f739cdc3630 SHA-256: f078e5517f50a306002194f28abb7b297892bc3232462b868f3ef802b786bb3f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, presenting numerous links to other PDF files, likely to obscure the malicious destination. The presence of a call-to-action button and the overall structure suggest a phishing attempt designed to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vandolderskb.com/images/usr/gepobijaxosalewafaw.pdf In PDF document text
    • https://diarch.in/WYSIWYGImage/file/9038014764.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/dafoxeti.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/jokememilodalikotuf.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/potugexubiw.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/23334155279.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/duzuvoparavaguwosel.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/nenuzexaginilawexugo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3af0a1b62---tivoduwuwezopusijivibusu.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/bekixogigo.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/20015068752.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/269287236.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/32891097246.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210903082258.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/29273583032.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/53934937073.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/rafaxalera.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/17333582841.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/kuperez.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/96696393223.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/xelala.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/37645042543.pdfIn PDF document text
    • https://tdfstore.it/file/20631026876.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210908131503.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/ddecffb60165001c80ff0620bb8e9496/60683659457.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=wizarding+world+app+apkPDF 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_off0000db51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB51 10400 bytes
SHA-256: 3bd67e6975e4d730a738e19de17da4e0c23121002acff1beceb05700ea6bfc7e
font_01_sfnt_off0000f2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BF 18968 bytes
SHA-256: b4f40cf042f230720af56b146850343e29edab68a8e2832e980c28b4e3e4d6a1
font_02_sfnt_off00012459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12459 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1