Malicious PDF — malware analysis report

Static analysis result for SHA-256 09ee6763cb4e8914…

MALICIOUS

PDF

76.0 KB Created: 2021-09-14 04:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 387ed76f01081bcaeb1b11496c2ac8e9 SHA-1: 982594b2ba8593851ecdd7947175fd63856717ef SHA-256: 09ee6763cb4e8914ac60909cfb8b395ebe2f622628f0802e15626293241ca272
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript and multiple links to external PDFs hosted on disposable domains. The PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicate a pattern of hosting malicious content on low-reputation domains, likely to distribute further payloads. The embedded JavaScript is likely responsible for executing the malicious actions or redirecting the user to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/rapevodi.pdf In PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/53925860510.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/xokuzamarotine.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/81586403143.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/59251729169.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/61652692050.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/jemukenafiporu.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/vibasimibelo.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/werusufirusebokaradazalu.pdfIn PDF document text
    • https://rjpexport.com/files/votiwejujefuf.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/7037220796.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/85732291750.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/68102062943.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/febadusosenaliledozu.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/nedate.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/11577063355.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/jopakoxotokixoxipurul.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/45974398266.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/66250310981.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/voforuj.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/nepijuzuwevopuledeponu.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/20219505650.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613023ae08d9c---nofavisedesilowifofonid.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/bibavimikemub.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/wetofetugulirig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=fajr+azan+mp3+downloadPDF 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_off0000bc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC07 21132 bytes
SHA-256: b7ab3ea357697650fdfe45895235fea5941179bd6fe22c6589250ae937047380
font_01_sfnt_off0000f2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DC 10488 bytes
SHA-256: f37a1a2ae93ebbae64131ec3b50a7a358d3c5d6040c12e40dfee9b8db1e15ddd
font_02_sfnt_off00010ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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