PDF malware analysis — malicious · da8fba13fd621ac8

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 14:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 03a708a801c9173fd7b060f5e9c6803a SHA-1: e025d835a271a40cbea31cc38eb6ca8e60d2e827 SHA-256: da8fba13fd621ac89155622c209755b33ebf8dc7e6fdfbfa975e5b46443cf3a4

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to potentially disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, suggesting the document is designed to lure users to malicious sites. The embedded JavaScript is a strong indicator of malicious intent, likely to execute further malicious actions.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://ecogestval.com/userfiles/file/wisuzepuvuxotig.pdf In PDF document text
- https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/94203080156.pdfIn PDF document text
- https://mashtalkandil.com/userfiles/file/fezotosobavabinosivut.pdfIn PDF document text
- https://pasarangroup2.com/contents/files/wajabenimibobafugifanuzan.pdfIn PDF document text
- http://wonikquartz.com/upload/editor/file/1630797295.pdfIn PDF document text
- https://avigailpekelman.com/sites/default/files/file/70969266016.pdfIn PDF document text
- http://tbff-bygg.se/img/files/74529662569.pdfIn PDF document text
- http://dlshixiang.com.cn/ckfinder/userfiles/files/99612033078.pdfIn PDF document text
- http://31kouqiang.com/userfiles/file/1631935469.pdfIn PDF document text
- http://bankerz.in/qpic/files/87823367175.pdfIn PDF document text
- https://nilsahost.com/calisma2/files/uploads/29893005817.pdfIn PDF document text
- http://bayanairag.com/uploads/userfiles/files/74872587813.pdfIn PDF document text
- http://anhhieu.vn/hinhanh/file/45470645269.pdfIn PDF document text
- http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/24176291827.pdfIn PDF document text
- https://equantumconsulting.com/files/files/19776327142.pdfIn PDF document text
- https://amrapalispot.com/userfiles/file/47333676565.pdfIn PDF document text
- http://pkynfe.net/userfiles/file/towexuwo.pdfIn PDF document text
- https://polaria.cz/images/file/8258631059.pdfIn PDF document text
- http://eyupsifalibitkiler.com/resimler/files/putejurogikaziz.pdfIn PDF document text
- http://zoekidsworld.com/userfiles/file/jinevexefubudol.pdfIn PDF document text
- https://novsport.com/content/File/12408695509.pdfIn PDF document text
- https://matfplayer.com/calisma2/files/uploads/37007812560.pdfIn PDF document text
- http://goghepcacloai.com/media/ftp/file/kifozaxetibo.pdfIn PDF document text
- http://stylekd.ru/files/47159878198.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=5+letter+word+starts+with+r+ends+with+nPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000db63.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB63	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f375.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF375	17288 bytes
SHA-256: `cf2d676630fe3b03b415b6d7e1d68ce0b09b4ae80102b1ecdddce9bd71a02d85`
`font_02_sfnt_off00012006.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12006	10468 bytes
SHA-256: `7d5102aa792865cfbd3cd766f1bed4751677393d569987308023e3f77a5827e7`

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