PDF malware analysis — malicious · c26a6011af1abf1a

MALICIOUS

PDF

87.7 KB Created: 2021-10-06 19:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: 28e7f4b749cced219d85029cf1f7c138 SHA-1: bf81b166283d3e00f8ac5ae6b716b8ab96505482 SHA-256: c26a6011af1abf1a56f158e0dc75bb65f8f1645027c6f7e10badcab43c8469cc

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it's designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to T1059.007, and the nature of the file suggests it was likely delivered as a Spearphishing Attachment (T1566.001).

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 https://pistant.ru/uplcv?utm_term=five+nights+at+freddy%27s+3+free+apk PDF link annotation
- http://urgentcarepb.com/userfiles/file/panabofe.pdfIn PDF document text
- https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149c948b8e2b---kimopasumapupufuxoli.pdfIn PDF document text
- http://bagiez.com/userfiles/file/rezomaxubaxixugupevoloda.pdfIn PDF document text
- http://aviteksural.ru/admin/ckfinder/userfiles/files/45278282150.pdfIn PDF document text
- http://hum-lucknow.org/test/fckeditor/file/debizutugubudonipu.pdfIn PDF document text
- http://kbchina.de/upload/nazoz.pdfIn PDF document text
- https://infotechb2blite.com/bot/ckfinder/uf/files/binudivisivit.pdfIn PDF document text
- http://cestovni-postylka.eu/userfiles/file/80334193921.pdfIn PDF document text
- https://salonorchidea.com/userfiles/file/fedebonerubuguge.pdfIn PDF document text
- https://zenit-npk.ru/files/file/26598656521.pdfIn PDF document text
- http://potya.com/36115030053.pdfIn PDF document text
- http://tienhasteel.com/app/webroot/upload/files/dumisebavome.pdfIn PDF document text
- http://bm-shower.com/userfiles/files/35221536249.pdfIn PDF document text
- https://soudureornementalelauziere.com/upload/editor/file/rifezasagibipevobop.pdfIn PDF document text
- http://dentalcenterstudio.it/userfiles/files/13033253806.pdfIn PDF document text
- https://vestol.bg/files/file/64840031713.pdfIn PDF document text
- http://jtravel.clickis.kr/FileData/ckfinder/files/20210924_F0ED40BE00FC5AD9.pdfIn PDF document text
- http://yanarfabrics.com/firma/files/84608019080.pdfIn PDF document text
- http://chamaeleon-produktion.cz/www/files/file/21047208355.pdfIn PDF document text
- https://berettyobne.hu/userfiles/file/12848112705.pdfIn PDF document text
- http://sushiosushi.com/uploads/files/jeverapifariberosanisobu.pdfIn PDF document text
- http://buyyoutubecomments.com/ci/userfiles/files/zefodobox.pdfIn PDF document text
- http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/12791490560.pdfIn PDF document text
- http://tufaghanafc.com/js/ckfinder/userfiles/files/lelerafij.pdfIn PDF document text
- http://vxclouds.com/userfiles/file/fajodigomano.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_off0000e4d7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE4D7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fcee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFCEE	11068 bytes
SHA-256: `5e6cad9ef4231e7c173e603d3974f028ddedf730fcabcabe5052f457a12e2f87`
`font_02_sfnt_off0001168a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1168A	22604 bytes
SHA-256: `d41551bf4f74e293bdf8c3c5d666fb9393d97aeacb3e6657d468b14ca6464d68`

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