Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ec2ff5f866b1e06…

MALICIOUS

PDF

86.6 KB Created: 2021-09-14 03:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f94883f49e111b0090bae4ebc1b7acdd SHA-1: d35e39b80f0aee82299a42f6585cce35e99f6577 SHA-256: 5ec2ff5f866b1e06dfec1f8eba80584212a84580d6f0b0dcdfddfdcfaa071332
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also references numerous external URLs, some of which are part of a link farm, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://vuatoyen.com/uploads/userfiles/file/botufifiribax.pdf In PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/62809188493.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/parifebufemomatapaw.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/87579644305.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210905182437.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/35667763921.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/ziguzuwepikimisojugo.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/52738810100.pdfIn PDF document text
    • http://juha.be/_files/file/piwemufu.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/18761028317.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134c380275d0---woduxinuzulazolifem.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/xutumele.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/60834416670.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/86883703376.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/62633777359.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/64124922981.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/tanudujodowubowe.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/pamakopudibolarofobobew.pdfIn PDF document text
    • http://alhegazgroup.com/userfiles/file/42118527444.pdfIn PDF document text
    • https://resicolor.com/upload/files/mipivisaregemovifarijuzor.pdfIn PDF document text
    • http://boki.hu/editor_up/mobokokivupituleti.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/ponejuluzarasamo.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/muwilinuwadutudekenem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=watch+the+blacklist+season+7+episode+1PDF 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_off0000ee22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10639 10836 bytes
SHA-256: aaf55bebc41c7d3adccce7e95993beadb3cf63004a3ced4994723b1c417a1f64
font_02_sfnt_off00011f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0E 17392 bytes
SHA-256: b0135cc279b1cef7136cc5b4b3fa16c4f5901d92aa44e33044c142a7b53980fa

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