PDF malware analysis — malicious · e42c3eb79f4a60f3

MALICIOUS

PDF

70.4 KB Created: 2021-09-26 19:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: a2b1f96213299af3e3e86fd10ed080cb SHA-1: 14e6f1c5b7b5c836c8d6239d0b138a69d0eec78c SHA-256: e42c3eb79f4a60f333fdeaea598247c0e9bf01b699258d7b484e98e2314898f0

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially malicious websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of distinct hosts, reinforcing the idea of a link farm used for obfuscation or distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9982

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://cerritos.songhakbbq.com/uploads/files/36452879301.pdf In PDF document text
- http://ds-dq.com/uploadfile/1632374909.pdfIn PDF document text
- http://aven.su/userfiles/file/57327868205.pdfIn PDF document text
- http://bkmarine.net/ckfinder/userfiles/files/1632092042.pdfIn PDF document text
- http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/xenojav.pdfIn PDF document text
- https://actorconseil.com/files/file/63927931485.pdfIn PDF document text
- http://kbidc.kr/upload/editor/file/1631920258.pdfIn PDF document text
- http://thingsantiquesla.com/userfiles/files/82742805353.pdfIn PDF document text
- https://portalbime.com/UploadedFiles/New/file/79664770781.pdfIn PDF document text
- http://antitumor.org/filespath/files/20210906031919.pdfIn PDF document text
- https://www.thaiahpa.com/flash/files/46596308193.pdfIn PDF document text
- http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/11116574774.pdfIn PDF document text
- https://izometal.net/mm/file/sedadisa.pdfIn PDF document text
- https://aspirecambodia-edu.org/userfiles/file/4003746839.pdfIn PDF document text
- https://art4you.sk/editor_uploads/system/files/babaraxuri.pdfIn PDF document text
- http://visusmarble.com/images_upload/files/33968686339.pdfIn PDF document text
- https://www.edmcenter.xyz/ckfinder/userfiles/files/fapelokobogikoguxepax.pdfIn PDF document text
- https://anandamsanyal.com/userfiles/file/35892378677.pdfIn PDF document text
- https://iskoruma.com/upload/ckfinder/files/32993266914.pdfIn PDF document text
- http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaf3fd83fa---pivijefivudixumibilizo.pdfIn PDF document text
- https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/f59eaf28337a3d6db1389291a80ee65b/73261323568.pdfIn PDF document text
- http://driver-jazda.pl/upload/file/galokomemusebapad.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=new+shareit+app+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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000b1ca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB1CA	10552 bytes
SHA-256: `ee0e004320a2ad1dcb661daf63703d62ca2f9b14819ac4f3f2c76b177b3a1f40`
`font_01_sfnt_off0000c9d8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC9D8	16528 bytes
SHA-256: `fdf591ff724183bb17c8a5e852c1d1d4e325898f0c271c711a73574220fe558c`
`font_02_sfnt_off0000f3bb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3BB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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