PDF malware analysis — malicious · 4572670e8c0180b1

MALICIOUS

PDF

72.1 KB Created: 2021-09-13 01:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 9324b91da274c84a10fb0f584fab126c SHA-1: 8e3f10c90a40330521fb243fbf6aad122ff5f5cc SHA-256: 4572670e8c0180b1c639405d5278e123d97692dd3da9847649508995c02f3c42

166 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to disposable domains and exhibiting characteristics of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of embedded URLs and the heuristic 'PDF_RANDOM_URL_LINK' suggest the document is designed to redirect users to potentially harmful websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9984

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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.
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://archism.ru/uplcv?utm_term=keyword+used+to+declare+variable+in+javascript PDF link annotation
- http://nwatchonline.net/userfiles/file/fozedurifulib.pdfIn PDF document text
- http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/jozikupakasusepigabasejom.pdfIn PDF document text
- http://clarksville.net/wysiwygfiles/file/logodiwamufigazesukin.pdfIn PDF document text
- http://morpheus-architects.com/file_media/file_image/file/27537892634.pdfIn PDF document text
- http://kmsenior.org/file/files/senupaxukifo.pdfIn PDF document text
- https://jxlmedu.com/file/files/20210909_193018.pdfIn PDF document text
- https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135fa501600e---65516103469.pdfIn PDF document text
- http://abwingsde.com/uploads/files/53314477154.pdfIn PDF document text
- http://mexxeopaint.com/upload/files/zuxogetopegiw.pdfIn PDF document text
- https://x-leather.com/radsportfiles/file/dexemagixitimazuruxexejaw.pdfIn PDF document text
- http://paoladebenedetti.eu/userfiles/files/sulujawazemokugokufe.pdfIn PDF document text
- https://shipnhanh247.vn/asset/files/kinowisesipigigasowebu.pdfIn PDF document text
- https://classoft.ro/userfiles/file/wawizutegates.pdfIn PDF document text
- http://lindendirect.com/ckfinder/userfiles/files/64292872839.pdfIn PDF document text
- http://geologicatoscana.eu/userfiles/files/44916879525.pdfIn PDF document text
- http://thucancakoihikari.com/luutru/files/56546711011.pdfIn PDF document text
- https://zhbiotech.com/CKEdit/upload/files/99744151863.pdfIn PDF document text
- http://foto-recepty.sk/images/fotky/lisomoreroxos.pdfIn PDF document text
- http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dazazivatokorawu.pdfIn PDF document text
- https://candica.pl/ckfinder/userfiles/files/677926978.pdfIn PDF document text
- https://ambulatorioveterinariosismondi.eu/file/76812387035.pdfIn PDF document text
- 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_off0000b5b3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB5B3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000cdca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCDCA	11132 bytes
SHA-256: `348d20caa274fceec653f742b4a9c6fa7279cf2459614fbe94efc0c4873797e0`
`font_02_sfnt_off0000e7b6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7B6	16500 bytes
SHA-256: `dd046f24d636030bee10e93b133ef882fe42e57b6178534e79be0ff35c5e92c1`

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