Malicious PDF — malware analysis report

Static analysis result for SHA-256 25e943ff68c5475d…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 20:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 3a87877a60ce58b44507f873b056128f SHA-1: c168c1b75244a141f1a3fecae9a37a3427823123 SHA-256: 25e943ff68c5475de96591e7ffb6fdf92b88dee297f44f31eace8fb1f4907232
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic indicates a high likelihood of malicious intent, aiming to obscure the true destination or spread malicious links across many domains. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

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://irlanc.ru/uplcv?utm_term=how+to+update+keyboard+in+android PDF link annotation
    • http://kmbb.at/userfiles/file/47045489136.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/sokunabuv.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/53968931552.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/72145335879.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021091202320770554.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/winunaxe.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/12500615808.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/5020595006.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/lugepuzolilifekok.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/56825757873.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/xisalaxatiwugemop.pdfIn PDF document text
    • http://belovosushi.ru/files/xavemajop.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/44614101831.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/99279896002.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/gagalisuzuzivo.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/32881160927.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/61819051072.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/mujaxubigo.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/170946948561330356caad2.pdfIn PDF document text
    • http://demkapi.com/resimler/files/nowotosorufas.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/61102327996.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/tavojidutavogejuzil.pdfIn PDF document text
    • 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_off0000da6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6F 10692 bytes
SHA-256: 3187b5a9e6a70654a70bec287b07b71a1970193d99c3542475c87baf0615ba90
font_01_sfnt_off0000f2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEE 17264 bytes
SHA-256: fdf46298d9c684cdf1aac12e2a19efb4c195440a11ea7ddaea76867187c577bb

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