Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a217aa7ee8159bf…

MALICIOUS

PDF

79.0 KB Created: 2021-09-14 07:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 118c0d924112d55d140124787880ad40 SHA-1: 204865a1eca536739fc51bc2863b06135614a1a9 SHA-256: 4a217aa7ee8159bf8c0238f60ae8245c75ab8450d0d113ef7ddc5384757a7d68
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to various PDF files, suggesting a link farm or distribution mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for a large number of links, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://sts-cct.com/app/webroot/userfiles/files/27370966159.pdf In PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/mowutu.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/15056391622.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/48054738100.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/lixexuxep.pdfIn PDF document text
    • https://diphong.com/uploads/fometile.pdfIn PDF document text
    • https://successalpha.team/upload/files/dupukilegakogili.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/95027016334.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/ratanode.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/30833083474.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/vejemegagerev.pdfIn PDF document text
    • https://ismart99.net/upload/files/75744457587.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161317362a7714---zulabad.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/80292162527.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/60286664187.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/61365702544.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/basixipikiribagika.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/faworatofisukoro.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12584724481.pdfIn PDF document text
    • http://furniture83.com/upload/files/70863711454.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/3434984591.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/15145276098.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109030936309413.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=asphalt+4+elite+racing+free+download+for+androidPDF 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_off0000d04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04B 11044 bytes
SHA-256: 1f9f9abbfe267ad0a711c595bf32dd0a68d043d275ef0f6ab085c350f9d8b54a
font_01_sfnt_off0000e9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FC 17164 bytes
SHA-256: ed70ad8b83631ecf6a604ea661bc723018252c72083aa628265d3aa48d81ee2d

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