Malicious PDF — malware analysis report

Static analysis result for SHA-256 782a3a7df8d03a77…

MALICIOUS

PDF

80.8 KB Created: 2021-09-12 22:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1c306182088a69d29462def06ff6afd2 SHA-1: 376096fefa86a474014f4f113163f5c6410785cb SHA-256: 782a3a7df8d03a77eab96b13977f32a815408ad68651391272ed776878094625
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating the PDF is used to distribute links to external sites. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it's part of a phishing campaign or a distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://wellfoto.cz/pictures/files/15490194653.pdf In PDF document text
    • http://dentherapia.hu/files/file/14527374908.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/wiwulonon.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/65147447142.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/detemusemerinakiwijar.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/xipolezepisodaziwumebeb.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/bazeramojutexexizi.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/1969694598.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/dakabalasuwibaj.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/zamizogugisozasiso.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/nakotegevisusixu.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/vunepajofixebibeduda.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/88059667695.pdfIn PDF document text
    • https://arerp.kr/data/file///35801499979.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/kiwotesax.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/jedodenomibuviregis.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/51210520321.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/mulujamabilakuvomo.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/jofoxusunegexuta.pdfIn PDF document text
    • https://masihpt2.com/contents/files/26853837774.pdfIn PDF document text
    • http://chikatere.com/Upload/files/13074556785.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/doxuzamavujavaterabilit.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/80653128144.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/60802400458.pdfIn PDF document text
    • http://tyextractor.com/d/files/21288845492.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=wwii+game+apkPDF 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_off0000d96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96A 10128 bytes
SHA-256: 45bcacbcb175e7c9015a56b833e947064f3dcb1db8fbe4e9f413656f62b57aa2
font_01_sfnt_off0000f00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00F 17528 bytes
SHA-256: 7e3902cf036758d7629c965348453ef410719f37853eebde2ae1942116c911bb
font_02_sfnt_off00011dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1