Malicious PDF — malware analysis report

Static analysis result for SHA-256 55110cced83a7e7c…

MALICIOUS

PDF

69.4 KB Created: 2021-10-01 11:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00e95532100495743370f261928e4649 SHA-1: 726323807fd1abc9aaab4c455dc3e06001d49fd9 SHA-256: 55110cced83a7e7cb32711b896bc3c7c14539761f746913841b60bc3dce66344
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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 https://cructi.ru/uplcv?utm_term=ps+app+download+android PDF link annotation
    • http://barefoot.pl/userfiles/file/dipimafavemi.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/41130528445.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/nozuvenidede.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/jcqpejgntt4t7iub2l0t83frt0/sunobezajokuferi.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/konudobefutabuxaw.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/xefusem.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/ac9ec90bec355979dc3f424e453eae5b/47767418671.pdfIn PDF document text
    • http://njxinbell.com/upload/files/44304967098.pdfIn PDF document text
    • http://ssp.by/var/upload/81031281341.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/51062601846.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/xosofivikiw.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/97495390348.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/piguradipudizuwujor.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/43600064201.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/rorirukibivipoxumepo.pdfIn PDF document text
    • https://maisonforville.be/documents/file/26090444210.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/silovun.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/53880520052.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/79947264579.pdfIn PDF document text
    • http://unchiulmihai.ro/files/fckeditor/file/nilinawofev.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/211123009153.pdfIn PDF document text
    • http://hocomesun.com/upload/67674356438.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/dobixuzanobuvufapasine.pdfIn PDF document text
    • 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_off0000b007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81E 10240 bytes
SHA-256: f319781d4f04782fbd11e18ec9742dddc33c39327aced2a14e8a55864b835f06
font_02_sfnt_off0000df2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2F 16200 bytes
SHA-256: acb16da379244d067300fba0d1bbf233375f5ef1429ffb315028536fb537e2aa

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