Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c5f44854032d16…

MALICIOUS

PDF

84.9 KB Created: 2021-09-11 00:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 45c8abba1dc98d98dcd0e2ecd4ea4bf2 SHA-1: c292fc7ae335a5fc717eefce0b2a9453f1a95135 SHA-256: f5c5f44854032d16fa14a050e39b7871ada3a96ed154ebc5cb35336e7e4364dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are flagged as link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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 https://philabc.ru/uplcv?utm_term=procreate+app+for+android
    • https://hchoanglong.vn/userfiles/file/96978811676.pdf
    • http://fairway.cc/images/blog/file/18446610077.pdf
    • http://moyamoya.center/images/hand_uploaded/files/63592864666.pdf
    • https://tssch.in/tssch/application/admin/uploads/file/42179740234.pdf
    • http://baoveantam.info/upload/files/52796535115.pdf
    • https://aiwcecckolkata.org/FCKeditor/file/4609676577.pdf
    • http://avtokapriz42.ru/userfiles/file/jidotisi.pdf
    • https://sitarasign.ir/data/file/kididobopoguzanixiwo.pdf
    • http://auto4-spb.ru/public/images/ckfinder/files/11898348345.pdf
    • https://hahapediatric.com/uploads/files/202109011212293118.pdf
    • https://www.gico.ge/ckfinder/userfiles/files/3129733504.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/fasgp3co0n0661u24dtmoa29r5/78679351715.pdf
    • https://onutglen.com/caningest/images/file/89144290407.pdf
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/pusotibafamado.pdf
    • http://georgewongdesign.com/gwd/upload/files/sipavofu.pdf
    • http://istvietnam.com/rich_editor/file/26360898381.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613415797e542---22495465267.pdf
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/41852849453.pdf
    • https://sportuna.be/ckfinder/userfiles/files/5892856227.pdf
    • http://vanhacollection.com/images/files/jipavaworuxuboweneg.pdf
    • https://tenfci.org/userfiles/file/74398278597.pdf
    • http://ylphs.com/ckfinder/userfiles/files/kuxagupajowupaxag.pdf
    • 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_off0000e71a.bin
9a622846b6bd623657c1f13f31eee524c7c9faefc1c7f57da881f6e25fe7c370		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE71A 18056 bytes
font_01_sfnt_off000115fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115FE 16792 bytes
font_02_sfnt_off00012e15.bin
910f8e96dd8831b2125ae361e774d8e092b0390dccf9a31048902c61fd00709f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E15 10400 bytes

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