Malicious PDF — malware analysis report

Static analysis result for SHA-256 18834c1ae62cc5a6…

MALICIOUS

PDF

80.4 KB Created: 2021-09-10 03:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: d6251bdf8a49eb206a6004c0a3a6ebc9 SHA-1: 84c513efe85793616c6c153b905103fe640468c3 SHA-256: 18834c1ae62cc5a68878b15a42f8528b4155d0fb7bde98c4b7c54929274bab40
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://coretry.ru/uplcv?utm_term=download+age+of+civilization+2+apk PDF link annotation
    • http://zaun-produzent.de/userfiles/file/79677969697.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132449be8f52---86790083320.pdfPDF link annotation
    • http://master-vin.ru/files/file/61743673860.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/40186224968.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/35136807071.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/wuvumi.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/14110117144.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/23773623491.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/73904083806.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/6134af806a654.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xizefulev.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613986282be48---63624062602.pdfIn PDF document text
    • http://hongdacable.com/d/files/56725395733.pdfIn PDF document text
    • http://clingac.es/d/files/42757736413.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/masuxopol.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/78357732348.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/37545308956.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/mitotidatotunibubunajama.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/98581978617.pdfIn PDF document text
    • http://schokozentrale.de/idata/82250848553.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/pufexarowimiwigodo.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/puxerufaxawugenukem.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/saxizalisizumakozofanuwuj.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/pudoteb.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/68282548931.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202109/1630857779.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_off0000d6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF1 10952 bytes
SHA-256: 835a9f2932e757bd8e51a86a6a3e2d8ad31717dcad94f13516b4a5842d4d6bbb
font_02_sfnt_off00010862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10862 16952 bytes
SHA-256: ae48ef7382bf64cb9852bd8d5cc7e18364c0c87736f0ecfbcb8cbe7fffe6631f