Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed1ff6bd5efa918d…

MALICIOUS

PDF

70.2 KB Created: 2021-09-19 13:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5e3436abcc7f5d32460e6959720b22f1 SHA-1: c400750ea513715ca51b898db4e65a2a734fd07a SHA-256: ed1ff6bd5efa918d0d8d5378c0b4bf1615a43ca61aba482b74af0b1c7a081f25
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. The presence of embedded URLs and the PDF structure point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://drafthe.ru/uplcv?utm_term=happn+app+apk+download PDF link annotation
    • http://johnmarzillier.com/ckfinder/userfiles/files/mefip.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/63486829316.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/rogigumawolevil.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/pegutaseran.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/pazeselusajipogonade.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/relap.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210914_043804.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/pefojufod.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/57355517587.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/nisepipasiwabenusolibaja.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/rarebirejuwufonubolurag.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/171918082941.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/93243462067.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a86d7463dc---kuruxof.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/92296632532.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/mesavixufesozo.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/26692095345.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/legedipuzesibo.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210909_909DE3B8102C837C.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/26722075283.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/13809810950.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/fakeda.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210914_432539A3D7A04C11.pdfIn PDF document text
    • https://duvanco.be/docs/files/dubizukuvudonutabik.pdfIn PDF document text
    • https://laser123.com/geektic/files/33884239551.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_off0000b75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB75F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF71 15072 bytes
SHA-256: 1d8e4302741867b3429a241c4742805f48becfd5cb75d3757f3db99e7ae234b6
font_02_sfnt_off0000f56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56C 9964 bytes
SHA-256: ec50b5dec3b1e8d147411729f566bd07100d0d389b502346d7f9ffe5665211fa

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