Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0575d779caccb80…

MALICIOUS

PDF

71.3 KB Created: 2021-09-29 04:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f3c7fc5af0f8339e17f7df628b77ff6b SHA-1: 649cf2c92a47167c515d3a51ec7bf059905bf6d8 SHA-256: a0575d779caccb806c16cc53e35933c85aeca339ff23eb40f45c0d125ccb63c8
146 Risk Score

Malware Insights

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

The file was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains numerous external URIs, including one pointing to a raw IP address, and is described as a link farm on disposable hosting. The PDF structure and embedded content suggest it is designed to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://lamgi.pl/ckfinder/userfiles/files/70511464148.pdf In PDF document text
    • https://073741256.com/uploads/files/202109041308467397.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109221916081229.pdfIn PDF document text
    • http://apart1day.ru/file/85553428351.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/vorisade.pdfPDF link annotation
    • http://qzgj.cn/upload/file/nibusix.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/78286972602.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd6e81a7c7---52506146052.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/9583047023.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/96249140034.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/84001010285.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/donevejokuvowoxofoxo.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/zamobonugudipoxik.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/tovexedagi.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161461adbe89ca---23149986799.pdfIn PDF document text
    • http://yansyuan.com/UserFiles/images/files/vakuvovixowoxukafa.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/duruxuduki.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/bewobuvuj.pdfIn PDF document text
    • http://vhshf.de/File/73766171923.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/91033928137.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/zijakapapudinuxafuzav.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/lozamozedeboveg.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/53980645465.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=birthday+song+mp3PDF 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_off0000b092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB092 11000 bytes
SHA-256: f7538712738ca571e2dddb825100477f3e1be1eb949d7fc9104e2f358bb51635
font_01_sfnt_off0000c9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DA 18260 bytes
SHA-256: 56e585e4ccda1acd360c035106264caebe2766a361b4782c72633af77cdc8d06