Malicious PDF — malware analysis report

Static analysis result for SHA-256 8615d88bed3c78c6…

MALICIOUS

PDF

79.5 KB Created: 2021-10-19 02:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: abfb1bca50f139c06c6ce3bf4193cec1 SHA-1: 5fdadc1b2c62ac20d6136897e479d7752d0c5c9a SHA-256: 8615d88bed3c78c653a5364900d2617316553d5175e8f8baaf852f6ceaf60f50
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains, suggests a link farm designed to obscure the ultimate destination and potentially lead users to phishing or malware sites. The ML_NYX_PDF_MALICIOUS heuristic with a score of 0.997546 strongly supports the malicious classification.

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://oroblupiscine.it/userfiles/files/pawozorofufa.pdf
    • http://soles2walk.cz/data/file/tefumitupemabanumitu.pdf
    • http://manilag.com/FileData/ckfinder/files/20210920_AAB7286273F55BC5.pdf
    • http://strelnicebudejovice.cz/userfiles/file/wakesomonelojado.pdf
    • http://kohaz.hu/files/file/tutinenofif.pdf
    • https://butterfly-propertymanagement.com/userfiles/file/tidogexetabafo.pdf
    • http://druckmaschinenservice.com/uploads/fce/files/nulitutagesifozetoronoduw.pdf
    • https://nieruchomosciprzetargi.pl/files/file/patejujiga.pdf
    • https://hoangvan.vn/wp-content/uploads/files/67918477545.pdf
    • http://corkpotters.com/images/tilapivajo.pdf
    • http://analhospital.net/file/files/jobibexur.pdf
    • https://oncallanatomist.org/ckfinder/userfiles/files/16415465047.pdf
    • http://egyptlance.com/userfiles/file/7910915388.pdf
    • http://vtvxm.vn/userfiles/file/96830404960.pdf
    • https://geloracinta.com/contents/files/vazaf.pdf
    • https://cortemadera.com/wysiwygfiles/file/77372782726.pdf
    • http://besttailor.info/ckfinder/userfiles/files/34723982778.pdf
    • http://cartonwrappingmachine.com/userfiles/file/daladivisad.pdf
    • http://etre-belle.su/images/file/28666438907.pdf
    • http://sakra.sk/storage/file/vejinimufagakir.pdf
    • https://mollis.rs/files/vunanajajav.pdf
    • http://maristaslardero.es/userfiles/file/48465592349.pdf
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/bekadovifitadogazi.pdf
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/loviveb.pdf
    • https://feedproxy.google.com/~r/Gsjc/~3/RhDyTiV0TgQ/uplcv?utm_term=how+to+play+iphone+ringtone+on+piano
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cde5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE5 16792 bytes
font_01_sfnt_off0000e5f7.bin
9babcec16d9779f4985825c03531b758e7d06040d0061ff6a201ef106efc6fb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F7 19072 bytes
font_02_sfnt_off000117f8.bin
a6f117d73104522a65c5459f81793de0eb775674cdb0ff8fc863700904dfb3e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117F8 10556 bytes

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