Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a48c675eaeddfc7…

MALICIOUS

PDF

82.3 KB Created: 2021-09-17 23:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3daf8f1ae708c08fbad34e859646559c SHA-1: 7ec440241e0b9306ac9a89ca15ce59ac612c4501 SHA-256: 5a48c675eaeddfc717ed13bd16e9242fb53e16ff9d4878ebea942283de0db9a7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://smidgel.ru/uplcv?utm_term=hue+widget+android PDF link annotation
    • http://falconltd.pl/cache/file/52034536946.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/92749084578.pdfIn PDF document text
    • http://ecoevopublisher.com/files/upfiles/file/97407922710.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/25265631260.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/sipaxapagetigo.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/vibedibizositen.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/676280682.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/guxemawaxojikimavorobusob.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/93770091180.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210902132520696564ra6rpw7wi87y.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/66720659260.pdfIn PDF document text
    • http://dezis.ru/uploads/files/kebopavimejunavin.pdfIn PDF document text
    • http://yjbiotech.cn/upload/files/nimukitodutuvum.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/nuzijox.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210906135450.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/dakexone.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210910121822.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/tigapuxoxoferuropaneto.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/45026071851.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/gexigamotogizepo.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/54403572368.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/996de597c9b58e2d410a5e1c622627d0/33423797675.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/kalevunepa.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_off0000dbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB0 18688 bytes
SHA-256: 70ddde9d3b05d3763a2aa2e1917e0fb13ed2d6d9917146a83bc696b2ecbe8e81
font_01_sfnt_off00010c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12458 10388 bytes
SHA-256: 984b24898e539fa38ae1819992f78e70bf37815cc6032350c0faeb1f4319f3f0

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