Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cc386427b8d65bd…

MALICIOUS

PDF

70.0 KB Created: 2021-10-03 15:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8e5514b19e41f1ec608901fcf6b14747 SHA-1: 1a4bc469cd600ba9f53b93705638926a0ecaefe7 SHA-256: 5cc386427b8d65bd5d5c03edb26c221e24acbb7a1e82bc9c4b365622c437ff03
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the large number of embedded URLs suggest the document's primary purpose is to redirect users to potentially harmful websites, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external links points to a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://sweet-sugar.de/images/uploadedimages/file/sanananuweduxejurowu.pdf In PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/tixekaxirigabikutijo.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/lamoxanetewabemafumaxemu.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/6854833032.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210910_BCCFC730172452C6.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/jikisavorurarodogus.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/dunenuda.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/98650308758.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/pivaromatuja.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/mobojomisijalalopafilo.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/36603366089.pdfIn PDF document text
    • https://shinaltd.ru/images/file/31069625493.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/bazoxidataxikujararufo.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/kejunupajeboxufulovadewex.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/48898939078.pdfIn PDF document text
    • http://cabini.it/userfiles/files/61309140163.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/jutetinen.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/49545663183.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/dubarexuna.pdfIn PDF document text
    • http://nensi.si/upload/file/fefonutogemetiwoz.pdfIn PDF document text
    • http://www.pilartangguh.com/file/75231207673.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/tirovozadoz.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/161393e6269849---xorowusupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=compliments+that+start+with+kPDF 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_off0000afc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DE 10724 bytes
SHA-256: b898fccb1429a06481bceda9f960dda0cf254bd63a936a7346c23cdbf2c12cf2
font_02_sfnt_off0000e05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05A 16696 bytes
SHA-256: 48f27aa5628ffa341d254b90dc97b6e4dabfd9126e840b25706fbea030cb1ef0

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