Malicious PDF — malware analysis report

Static analysis result for SHA-256 c096b3dbfd50889f…

MALICIOUS

PDF

84.8 KB Created: 2021-09-10 07:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c967bda034f84e8284262da151cdf339 SHA-1: eef8580389d70a5ac2002b302bae54b88c74f204 SHA-256: c096b3dbfd50889fe9bbabf4aa27744f274b2de4ce6c840daddb936230e27895
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many pointing to disposable domains, indicating a phishing or link-farming scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for credential harvesting or malware distribution. The presence of embedded JavaScript (T1059.007) further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hotelclinton.it/userfiles/files/rufiwivovasonuxilumurido.pdf
    • http://getwealthythisyear.com/ckfinder/userfiles/files/63173262200.pdf
    • http://friend5190.xyz/js/ckfinder/userfiles/files/94135160565.pdf
    • https://projektovanje.info/userfiles/file/25776147963.pdf
    • http://cochemical.com/upload/files/jejipidatufuwaziwex.pdf
    • http://goldenteriyaki.com/uploads/files/kazuvapukadaxuj.pdf
    • https://asiarsolutions.com/userfiles/file/takotirabexenineta.pdf
    • http://autoachtercamper.nl/userfiles/file/73998446948.pdf
    • http://hladonural.ru/upload_picture/12943803577.pdf
    • https://cancelaria.pl/galeria/file/jewiwowosatemalozogonev.pdf
    • http://semanbio.com/upload/files/29957075446.pdf
    • http://cuakeobinhduong.com/upload/files/2660458583.pdf
    • http://k3projekt.pl/uploads/userfiles/files/61442788972.pdf
    • http://s-privod.ru/userfiles/file/79740513886.pdf
    • http://surtek.biz/image/files/20150320_124340.pdf
    • http://immobilieninvestors.eu/userfiles/file/vewuvebemanowazex.pdf
    • http://www.uds-myanmar.com/image/upload/File/10491676058.pdf
    • http://hfengly.dk/skoleportalen/userfiles/file/gadiruxuzadadabulutojilor.pdf
    • http://vivaibonomo.it/userfiles/files/bulav.pdf
    • http://elcampoeco.org/FCKeditor/file/85195299578.pdf
    • http://hstechno.com/userData/ebizro_board/file/53114697250.pdf
    • http://kabaretyimpresariat.pl/Upload/file/sadajipokomutu.pdf
    • https://pima-alarms.rs/slicice/file/57322646820.pdf
    • https://codecs.ro/images/file/bizirekifabude.pdf
    • http://hmondo.com/userData/board/file/xamorikolew.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=mindmap+open+source
    • 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_off0000e8a0.bin
d9b2713f35f82cf6baaa1e23f0a620a1962241f6417e70b6e8c3dbf475d07337		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A0 17092 bytes
font_01_sfnt_off00011516.bin
6a31622ee1bb7e162f5b9181dd9240c4eea8312da9c8cf659577947d417d94ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11516 10624 bytes
font_02_sfnt_off00012d4b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4B 16792 bytes

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