Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd8a79f49472082…

MALICIOUS

PDF

77.3 KB Created: 2021-09-15 20:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cf8b4b9fab4b0b0a1b07e1da487b5221 SHA-1: d3eefbd010b77eaa77c8c27eba1a36d26a06d45a SHA-256: 8fd8a79f49472082363c32d344c06db7f6d1d8d62e564e232ce2f37ae13cef0a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on suspicious domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://specializzati.tecnaevolution.it/dataload/ckupload/81930913765.pdf In PDF document text
    • http://robertoantoniz.com/resources/original/file/92081342324.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/wajevujasawozat.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/14143051510.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/neluwizofenuluve.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/63963509842.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/keduritavilu.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/85670064340.pdfIn PDF document text
    • https://bagstyle.uz/images/file/38965018974.pdfIn PDF document text
    • https://wita.lt/images/files/16250963752.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/jesakilozurekulivofo.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/66309960650.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/noveginelame.pdfIn PDF document text
    • http://poorclarescork.ie/images/82010057625.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210914_101402_141.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/58003444135.pdfIn PDF document text
    • http://sushi-belovo.ru/files/93321239571.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/rifezetirilagomojosogeruz.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-4/20210904213153755064.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0e3737246---taduseropivo.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/godirepokezarupelamowe.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/jobiki.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/jawoletizateredulorowami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+do+i+connect+my+phone+to+my+fire+tvPDF 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_off0000cae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE6 10768 bytes
SHA-256: 592b76ba0ab079de46a415670928402f0a2c899b500456312afa2fb822d21631
font_01_sfnt_off0000e371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE371 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB83 17188 bytes
SHA-256: 409b0e31d021352340f47363f963f30660b07000157b2b0e9c776388eb6fb6bd

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