Malicious PDF — malware analysis report

Static analysis result for SHA-256 183f3394ba0f600a…

MALICIOUS

PDF

83.3 KB Created: 2021-09-18 08:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9b1f8a65ad26652e9940452411900c26 SHA-1: 3983ae15e5083128195931236f24977fd11eb468 SHA-256: 183f3394ba0f600a5cb561a2074197eea1641ddf18830bf1033553fb00d24bf2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous embedded URLs pointing to external sites, suggesting a link farm or redirection mechanism to deliver a malicious payload. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of using disposable hosting for link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://maximaviajes.com/FCKfiles/file/71268384594.pdf In PDF document text
    • https://pro-biomed.com/admin/userfiles/file/53024099520.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///xopisowamorobulo.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/pizowonopazapidonejujegi.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/94561095822.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/26414963222.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/62942861026.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18702895701.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/jedutosavetafesadomobu.pdfIn PDF document text
    • http://hk-keber.de/images/file/58252135089.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/22896772684.pdfIn PDF document text
    • http://e-district.org/userfiles/file/fitelaferukex.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613645106d06f---22183467178.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/70382037708.pdfIn PDF document text
    • http://webs123.com/userfiles/file/vonowapomogasav.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/85865301708.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pukumolugo.pdfIn PDF document text
    • http://caythuocnam.org/images/files/muvuvojitosudibitu.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/86786578454.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/tatizug.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28427866720.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/77276268811.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/55719380134.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/lamivalotemepogetebajodo.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/74677432244.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=pvz+2+hack+ios+2020PDF link annotation
    • 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_off0000de64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE64 10308 bytes
SHA-256: b0189f9a6e897d454522517f573c696a57ade9e67d219f5a4b88e6000f4c86ea
font_01_sfnt_off0000f5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF3 18904 bytes
SHA-256: 36d74d355bd1064bb17fdb3f81a50ed8faa9317d39542c537b1b3bf3f0806b7e

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