Malicious PDF — malware analysis report

Static analysis result for SHA-256 5908842fedc60237…

MALICIOUS

PDF

70.1 KB Created: 2021-09-26 06:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b5f36ab3bdc691e8b5cb35ed19522f4 SHA-1: 756dd2136ca872e2e6dba3c4fbb87286ab947683 SHA-256: 5908842fedc60237f2f07c25d59f8199f9e86e0f019467c9af763ce8043c3d9f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous disposable domains hosting PDF files. The embedded URL and the nature of the link farm suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://seghers.kr/data/editor/file/1452228722614e7a92d0a83.pdf
    • http://xn--9w3b270a7kf.kr/data/editor/file/rebajosude.pdf
    • http://ohsongpharm.com/ckfinder/userfiles/files/puniworotina.pdf
    • http://somkuthyoptika.hu/editor_up/86039729146.pdf
    • http://konstruktor33.ru/app/webroot/files/files/kugupesaw.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/b2c9b4ad63ff00633b239e546d5037f8/53190968497.pdf
    • http://faizleathergloves.com/userfiles/files/66778339683.pdf
    • http://bienbao.org/uploads/files/86096434007.pdf
    • http://eurolocal.info/sites/default/files/images/file/jedumirupekuji.pdf
    • http://studiotecnicomancini.eu/userfiles/files/36191026195.pdf
    • http://fsgzb.com/upfolder/e/files/20210914083659.pdf
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/limev.pdf
    • http://zhfangyuan.com/uploadfiles/files/seruderipe.pdf
    • https://kovtec.pl/eurostyl/photos/file/49644242584.pdf
    • http://tnslib.tools/userfiles/files/51007406006.pdf
    • http://asqcert.net/files/files/39490745658.pdf
    • https://olterus.com/contents/files/dujubivavidimopikiboxoxik.pdf
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/20219203108624.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/gupewapeduzafid.pdf
    • http://chocoenglish.com/_UploadFile/Images/file/2016220303.pdf
    • http://cansuyu.org/resimler/files/33157326492.pdf
    • https://nnt52.ru/userfiles/file/fajesiroderefek.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=pubg+lite+new+update+0.19+0
    • 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_off0000afc7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC7 16792 bytes
font_01_sfnt_off0000c7d9.bin
9eb2cf86f0fb61ccb076263e78b184bd956cee7900b3165f7c92be8b1342517f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D9 16040 bytes
font_02_sfnt_off0000f176.bin
5654b02f9fffca7bd6f3f863195b76483dbc9a82bdff8bfd4834660db2de1b8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF176 10912 bytes

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