Malicious PDF — malware analysis report

Static analysis result for SHA-256 a792c7795931fddd…

MALICIOUS

PDF

74.7 KB Created: 2021-09-08 13:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 408a8ca5fb0910210aea13d82844dbd7 SHA-1: f066d0188f3356eca05347ef6a492bba5e4b2e4e SHA-256: a792c7795931fddd6b6adef940e5553fbf5e896c2ff79adc0f4091fb69449181
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, with one identified as a disposable hosting link farm. The document body is heavily obfuscated, preventing a clear understanding of its direct intent, but the overall structure and heuristic firings suggest a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://rld-carbon.com/file/bozumufe.pdf In PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/fujotatud.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/20691538357.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/bikenavifenis.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/14799489472.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/fulololomubufujiluxu.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/51462655680.pdfIn PDF document text
    • http://mcdanielz.eu/files/file/ziwusamobulot.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/38300064967.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/40602594488.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/luliwizeme.pdfIn PDF document text
    • http://sangsangins.com/upload/upload/file/82931095366.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea92571f2b---2887652571.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/tudajewafamitobaka.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/ziwonotukibasudizemebox.pdfIn PDF document text
    • http://123dvere.sk/files/file/86852957578.pdfIn PDF document text
    • http://synergyproperty.com/images/files/60282148848.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161352bab215c1---nupemefurolujakogawez.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/vezudibipazena.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/61340268628.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/79796456110.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/kujebavidevax.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/rixepajokovepubajokiwafan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=hbr%27s+10+must+reads+on+strategic+marketing+free+pdf+downloadPDF 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_off0000bf24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF24 11580 bytes
SHA-256: 011870dbe099447297a1f39f4ea68268472fd529cfdeea33a19981353fa3635b
font_01_sfnt_off0000da58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26A 16276 bytes
SHA-256: 9238b7e5df339f9fdfb0e4fa2f47bd9ac0f6fa56137c4b7ab00e802310f4331b