Malicious PDF — malware analysis report

Static analysis result for SHA-256 570af9827bf76eb8…

MALICIOUS

PDF

82.7 KB Created: 2021-09-17 15:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 58c78214dcfde393742e7e283ec38d57 SHA-1: 9706a4d735143c3a559db1b98001bd4720c58749 SHA-256: 570af9827bf76eb88a232a9d1b1478a9921ab0a9f55f1721b92b541caa570de9
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external URIs and a raw IP address, indicating an attempt to redirect the user to malicious sites. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent, likely for phishing or malware delivery. ClamAV also detected it as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=best+games+in+2021+android PDF link annotation
    • http://dighakanchaninternational.com/FCKeditor/file/tusepeviterarerenubenokip.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/43392694408.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/rasad.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/53813249063.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/43675695023.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/bimitamujuwamamoveziv.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/zogisisitufawalikupumefod.pdfPDF link annotation
    • http://fongyoskert.hu/userfiles/files/36585694800.pdfIn PDF document text
    • http://pfollowers.com/ci/userfiles/files/wotavera.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/26085759461.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/39086683061.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16142a62c2d366---65129749275.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/tofifunibufugirop.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/barepawewufusux.pdfIn PDF document text
    • https://masukpt2.com/contents/files/2461988349.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/pupezagewujezonawika.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/dufugapodawukav.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/48916063390.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/73865217142.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/60633418225.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/57476349394.pdfIn PDF document text
    • https://businesslife.com/content/files/piretevux.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/fatorobururamavotide.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/32253342414.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_off0000df7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7F 10892 bytes
SHA-256: 2d5e4bdb9afa8a2aa8d77360e118763d42ce0c37116929aa88a1bb73bba5153d
font_01_sfnt_off0000f898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF898 17284 bytes
SHA-256: 4ceedc8ac7b6c9bf5c6866e830a53c180041ba53b56d0bbecc21a35a3402103c
font_02_sfnt_off00012519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12519 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1