Malicious PDF — malware analysis report

Static analysis result for SHA-256 8423af48bd1bd770…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 02:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 293e24841b44532bbe892b04305c234e SHA-1: f3dc42af82cd198780c15ca8080d54573783e54b SHA-256: 8423af48bd1bd7701b58ea91930ba32c9546d0b431aeee0a93ac8e5f3e5173f9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged as malicious by ML classifiers and ClamAV. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a large number of external URIs, many of which are hosted on domains that appear to be part of a link farm, suggesting a phishing or redirection scheme. The presence of embedded JS and numerous external links strongly indicates an attempt to lure the user into visiting malicious sites or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://interativacorretora.com/fotosempresa/files/dewovewoguvivibopexuvani.pdf In PDF document text
    • http://blfimmobiliare.com/userfiles/files/guruwak.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021091119451273499.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/pelutedodataleduxe.pdfIn PDF document text
    • https://hoavily.com/uploads/files/81948014465.pdfIn PDF document text
    • http://boardmark.com/files/file/47126317547.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/kilorerizek.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/19426612283.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec27b2b0cd---gunixuwiwekironututojizuz.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/91016643501.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/53128363746.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0bdff0ceb---burabasexobivemepego.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/13027161340.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/xajirabudijedobatoso.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/62061239018.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-19/20210919141525329519.pdfIn PDF document text
    • http://tulga.ru/editor/files/biwinimotilakutokek.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/38425310665.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/sekukokebositutogi.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/42584443158.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=things+that+start+with+h+for+preschoolPDF 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_off0000e139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE139 17412 bytes
SHA-256: e89947a5e8ac501fba64f56c100750e500c7b242ac89e8e5c969d6adcbc90e39
font_01_sfnt_off00010e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E48 10808 bytes
SHA-256: 8cbf3c80762901e0200aaccf5edca8a4620e40a4599264fc245b021ba2664f22
font_02_sfnt_off0001273c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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