Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7aadc7c4fad67a8…

MALICIOUS

PDF

80.1 KB Created: 2021-09-19 06:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4e53b1d5bd637baca09e9d3aebdf931a SHA-1: 0fbe79852447bee816dd67c8a6a74d36ab827dd9 SHA-256: c7aadc7c4fad67a83fc1f1476441db516f1f13722fdc5319d646cdcf60063b34
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm pattern, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://coretry.ru/uplcv?utm_term=beat+your+boss PDF link annotation
    • https://bywuf.org/upload/editor/files/87337794326.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/jatenunotek.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/57609793546.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/wuget.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/30833083474.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/jukamorowotilinupuvi.pdfIn PDF document text
    • https://combrooncom.com/contents/files/67880844701.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/60dfbe35e2bce87956cea993885210c6/90921204360.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/faloz.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/6397942309.pdfIn PDF document text
    • http://rapet.hu/files/61232669688.pdfIn PDF document text
    • https://arkadas.yuzuktr.com/eskortarama.com/resimler/file/kupexitizijadifiwinobobux.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/zofoxerobek.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/xuvufigipunedes.pdfIn PDF document text
    • http://360global.ca/userfiles/file/61132906946.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/voloxebigutaxalejojiz.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/favezufinivixevurijilabov.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/banetukulom.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/6223214706.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16140257b88238---zigaxevumoxigavadikijibe.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/61188771119.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/zapuxewitololuluwakijawab.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/45073501520.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_off0000d530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED42 18148 bytes
SHA-256: 59b94bf325e175a29676787e0f8b5990cff70bf4bc56baa5f7a63e23f322efa2
font_02_sfnt_off00011b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B99 10268 bytes
SHA-256: 25c123b856d9ef5b8bad6b6b6139a5a9878d9dc90bb3100460fed61e0664dac5