Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf27dd9f5534910d…

MALICIOUS

PDF

69.2 KB Created: 2021-09-29 06:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c2f78dcb8d2a654557c6b648b9eec2be SHA-1: 6ec68f69303def09da85a7c68d10b55a78dc3a1f SHA-256: cf27dd9f5534910d2ac7325a355ae5ceb19f06b80fddddb9bf1603233d39ba3d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a phishing lure, likely designed to trick users into downloading further malicious content. The document body is heavily obfuscated, but the presence of embedded JavaScript and numerous external URIs suggests an attempt to redirect the user to malicious sites or download additional payloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://infrive.ru/uplcv?utm_term=how+to+use+wifi+direct+on+android+phone PDF link annotation
    • http://cuacuonnhaxuongbinhduong.com/upload/files/50270978563.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/79292673787.pdfIn PDF document text
    • http://basar-hemeringen.de/ablage/userfiles/files/75259341822.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/tojujuvasepal.pdfIn PDF document text
    • https://rapn.ru/ckfinder/userfiles/files/mijikidesimaselitame.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/65178518355.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/gipefiga.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/wesolewo.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/96018914175.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/zofepi.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/monijiditawepesofifafudut.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/60496492366.pdfIn PDF document text
    • https://afraitn.com/basefile/afra/files/lutoperude.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/24480951825.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e3549ca6ef---suxiripu.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/miviturikaxune.pdfIn PDF document text
    • http://elitacasa.it/images/file/pukupofigavo.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/gepisefoxexizeridorusob.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/4629478755.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/vesizitukuzopijurisebar.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/73491941403.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021090205145873499.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/42875929163.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/gowodozabegig.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_off0000b1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B7 14356 bytes
SHA-256: 6d8ddc1e7dde249e852e9499177a9f64cbfc042f8fafac83e174bacaa3ff46bf
font_02_sfnt_off0000ed72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED72 10848 bytes
SHA-256: 848a5e59339cf8f505fe85e01aed57da9b5cf6d2d5dc99e95fb618f89222f4c1