PDF malware analysis — malicious · 8a3cf26ff389d2e7

MALICIOUS

PDF

85.1 KB Created: 2021-09-16 23:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: fa4153d4b6a497203b6b867e80b25548 SHA-1: 77a27564628a72e7b5d57da6860a0f964cf1c1b8 SHA-256: 8a3cf26ff389d2e74c4d8a19ff8b011205a5ab329897cb4902b087e2fd41961c

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

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://romengo.com/ckfinder/userfiles/files/45244572454.pdf In PDF document text
- https://insolite.lu/img/userfiles/files/72529741507.pdfIn PDF document text
- http://csc021.com/userfiles/file/20210912183735_g2f9vp.pdfIn PDF document text
- http://cheumst.com/upload/fckeditor/file/wexeguninutaluvevuraval.pdfIn PDF document text
- http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/xazonavufazorazu.pdfIn PDF document text
- https://jungleflightchiangmai.jungle-flight.com/Uploads/files/66669934197.pdfIn PDF document text
- http://aitrans.cn/UploadFile/file/F1202109061818083406.pdfIn PDF document text
- http://crabandclaw.com/uploads/files/fakofidaxamewotudagi.pdfIn PDF document text
- http://laxycoffee.com/upload/files/boziwisabujikodave.pdfIn PDF document text
- http://muabannhagiare.net/images/uploads/files/goxibuxineki.pdfIn PDF document text
- http://fotostudiovaccari.it/userfiles/files/mitijadujukebi.pdfIn PDF document text
- http://aqcorth.specialty-match.com/upload/files/newov.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334ed78bde2---60760843815.pdfIn PDF document text
- https://ewastexperts.com/userfiles/files/fefovonuwuku.pdfIn PDF document text
- https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/85732982178.pdfIn PDF document text
- https://malabarmail.com/ckfinder/userfiles/files/77406754134.pdfIn PDF document text
- http://ajej.pretty-match.com/upload/files/sapekodanuridojofo.pdfIn PDF document text
- http://aviatechinform.ru/sadm_files/zijovezajedowofapetubu.pdfIn PDF document text
- https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/92338569923.pdfIn PDF document text
- http://iiiemjobs.com/FCK_Editor_Images/files/dudivikevuwamanuvobon.pdfIn PDF document text
- https://www.xyoaa.org/sites/default/files/files/levawojaritowirowelu.pdfIn PDF document text
- http://laboratoriodiprogettazione-ve.it/userfiles/files/bepevevixebapanufuxobijom.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=private+insta+story+saverPDF 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_off0000e967.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE967	10236 bytes
SHA-256: `e94d9958d50efbe6a653d2b0879271391f9ca2e0242d2130145e088e2722dade`
`font_01_sfnt_off00010091.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10091	17924 bytes
SHA-256: `f300f7ec6a60225c4df7805ebdcb1383ece4c7ba32e047046be0f4fd00c8bbd3`
`font_02_sfnt_off00012ee6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12EE6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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