Malicious PDF — malware analysis report

Static analysis result for SHA-256 eda41cc181270782…

MALICIOUS

PDF

71.0 KB Created: 2021-09-18 22:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 18270b3d549be02f2906cf467438eb48 SHA-1: df93dfeb9d0c6937c19bf26d0bdf65adff3009b9 SHA-256: eda41cc181270782a722332e6e80f2afcbe2bb82df86e960b7b0475066af6eb0
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. It contains numerous embedded URLs pointing to external sites, with one specifically identified as a link farm designed to redirect users. The presence of external URIs and the overall structure suggest this PDF is used as a lure to direct users to potentially harmful content or phishing sites.

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 https://cructi.ru/uplcv?utm_term=adventure+island+apk+download PDF link annotation
    • http://lanaecoloridabruzzo.it/userfiles/file/fexejez.pdfIn PDF document text
    • http://mobil-tech.com/files/rakizubaxuferutav.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/43551074811.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/10105583915.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/99880537872.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/8297352101.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/xefavizapirebipifukogo.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/buminewelelim.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/56941565251.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/nafopebasemimipinifurix.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/tubidus.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/24268312666.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/latizisasomox.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/93975544253.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/57091911602.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/74090253286.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/6466583272.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/43111224719.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/gibalililekafotusemi.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/84654605272.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/berunodemiwemakuzipe.pdfIn PDF document text
    • http://nensi.si/upload/file/vixakegewiginenon.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/waduf.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/71559553266.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_off0000b30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB30D 10712 bytes
SHA-256: 2d3949b4eb9ca12e832cba47a8a39580895cd1edc5a3525ad6dc6eac01940e41
font_01_sfnt_off0000cbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EF 16900 bytes
SHA-256: 3b6f192c54fc94f253a5b77c2c40fd3033e197232bd68d609ddd4f85f9204089