Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c41dd2dfce29b87…

MALICIOUS

PDF

84.7 KB Created: 2021-09-13 11:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9ae264e8f0ddf27b350d1f9189eb416f SHA-1: b2f562e259a217c0d55269ffe87c38ef09236fd0 SHA-256: 8c41dd2dfce29b8711591baa357363660916b90e972c809aad210605cd5375d1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to various domains, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of these links suggests a phishing or scam attempt to redirect users to malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://www.corazondelsol.es/ckfinder/userfiles/files/wiwesopozoguma.pdf In PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aa871a9c6a787b8f4ea6c9386011e82c/56176388682.pdfIn PDF document text
    • https://projetovm.com/uploads/files/86595928138.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/2209322498.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/nemababulamewakebuwunur.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://chelseafoodmart.com/uploads/files/88657593319.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/2846830832.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/lopoduwetugawulotolaro.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109061420167810.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42859980179.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/paretuma.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/logexebodidimugalagaji.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/32960211566.pdfIn PDF document text
    • http://aimic.com/userfiles/file/lukifogobuj.pdfIn PDF document text
    • https://webmenuplus.com/images/file/14505796698.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/davc9lo86pm919jbdg1ii61b74/79092139407.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/pimovovazikuderepugav.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/sekefutibaxozimok.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/marafudavixazar.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/tixejajexo.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/57018084567.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=spyro+games+for+androidPDF 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_off0000e976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE976 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10188 16664 bytes
SHA-256: 1cc8797f43800e399fdd5ba3779aa258007438a8a8633f86110c8f7a50dd20c6
font_02_sfnt_off00012c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C88 10888 bytes
SHA-256: 0605d80aab07f0cc23d902fa4acf4e31bf7fdcf725d0ebfd7ded2b647364e2e4