Malicious PDF — malware analysis report

Static analysis result for SHA-256 f349d63faa938a74…

MALICIOUS

PDF

70.0 KB Created: 2021-09-11 23:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a09f5a768fca12b53b1503012b45cfb2 SHA-1: dc6189f8292c49b65882f1b44fd9d7e337f50383 SHA-256: f349d63faa938a74479d461d1833630afac96c5ff606d82d1d01e948f106b2a1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are likely part of a link farm. The primary attack pattern appears to be directing users to potentially malicious external sites, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://rachelrom.com/rescontent/file/65741392495.pdf In PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/pejaraxilulubopif.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/35865384197.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1631029729.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/tifal.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/93929382399.pdfIn PDF document text
    • http://lukinserv.hu/file/79860645995.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/vozadun.pdfIn PDF document text
    • http://rurisnet.org/images/file/guwajopopetipenuwijeza.pdfIn PDF document text
    • http://partnercable.com/files/35555829976.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/175730445861326099a25a5.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/dinufeto.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/mosunetisofizusopawum.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/36242202403.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/22166276782.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/nowetizixeke.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/kewakipejes.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/161365760a5a3a---bugizubufiwofoturos.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/40379938547.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/vedutuvig.pdfIn PDF document text
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/53271496462.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/bilapifisugegelaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=killer+bean+unleashed+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_off0000b3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CC 10596 bytes
SHA-256: d114a21c09aaac3696f7c6e97ac65e09e04c419576810172eaf72051a4ba5c62
font_01_sfnt_off0000cb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB99 15312 bytes
SHA-256: ca7f483added463a1e88f084f8f7a39306f36ecc4c8b3cbf2db052dbe94d6613
font_02_sfnt_off0000f250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF250 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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