Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e3ba95b231bbb3…

MALICIOUS

PDF

81.4 KB Created: 2021-09-21 10:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bc07c5f83beb96523aeffc4f1683b4b3 SHA-1: a87d4dc30a7c5c13f2045197a6e3dac5c98d4ea2 SHA-256: 31e3ba95b231bbb3c1a97283f887078bf2a719af71882830000b0e9eca522a54
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs and a heuristic indicating a 'link farm on disposable hosting' suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://archism.ru/uplcv?utm_term=how+to+hack+wifi+password+with+qr+code PDF link annotation
    • http://easyliveconstruction.com/ci/userfiles/files/jenogagujezakizidera.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/11978516272.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/80861766473.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/pitagisoxoxepatobutez.pdfIn PDF document text
    • http://www.celso.org/download/99696595329.pdfIn PDF document text
    • https://premiersuli.hu/files/files/nupusodafazogujawuzawepik.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140e45ec3ca4---42904681767.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613039425a3fc---56811412554.pdfIn PDF document text
    • http://www.andreapondika.cz/file/66132944105.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/546489477.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/pedewibumerupam.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/lopawezurokumizajoz.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/sezuvivogel.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/notop.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/86058302673.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/sowitutokuxumow.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210901205430.pdfIn PDF document text
    • https://digicpictures.com/downloads/nevaxu.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/20992190465.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/masazeta.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/tajebejasamafuselusil.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/81194034226.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_off0000d92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92A 17856 bytes
SHA-256: 63999baa92c50af512c62bc88f998cd958f5afb749790da52424c60056b6cea2
font_01_sfnt_off0001079e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB5 10884 bytes
SHA-256: 67726f884887b05a7a201045a6a0a9d1b31c83f8d66746cb1f9e73f7aa6a39db

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