PDF malware analysis — malicious · 13780a8e3eb55761

MALICIOUS

PDF

69.9 KB Created: 2021-09-09 06:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: e9378224b4f302448518dc131a6861f4 SHA-1: 4b7420600d081217ffe0d5d350ba448c8ba031b6 SHA-256: 13780a8e3eb55761fceeb5210bbe21252572e1064531db04fbe47ebe66d7e1e3

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, with a high ML score and ClamAV detection indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's part of a link farm designed to host many PDFs on disposable domains, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or download process.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://www.enredmail.com/templates/files/idCliente_/file/sarodinegudevelaw.pdf In PDF document text
- http://machi-tomo.xyz/js/ckfinder/userfiles/files/291331842.pdfIn PDF document text
- http://studiolauramoschini.it/userfiles/files/vefomopalim.pdfIn PDF document text
- http://msslink.ru/userfiles/files/nizore.pdfIn PDF document text
- https://elearning-chemistry.ro/userfiles/file/55907233358.pdfIn PDF document text
- http://belv.ru/userfiles/file/zuxipadirotolex.pdfIn PDF document text
- https://rcvizovice.cz/ckfinder/userfiles/files/25561551907.pdfIn PDF document text
- https://yuanfuconstruction.com/ckfinder/upload/files/93955057013.pdfIn PDF document text
- https://oklogistic.lv/upload/file/81155550945.pdfIn PDF document text
- https://oncallanatomist.org/ckfinder/userfiles/files/nefim.pdfIn PDF document text
- https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/ripap.pdfIn PDF document text
- https://hohsingfiber.com/ufiles/files/mumakurinaluloxif.pdfIn PDF document text
- http://rent-lease-no1.com/userfiles/file/20210907011039.pdfIn PDF document text
- http://videofilm-tv.ru/content/File/fojebisamazumometil.pdfIn PDF document text
- http://kadh.kr/bobod/upload/file/maposujipuxusowubelamo.pdfIn PDF document text
- https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/ea4f594831fa7608842b279ba4bdb2b1/74722577290.pdfIn PDF document text
- http://zoekidsworld.com/userfiles/file/33965873044.pdfIn PDF document text
- http://studionegrelli.it/userfiles/files/92139143634.pdfIn PDF document text
- http://softtox.pl/new/userfiles/file/melalafenematorowi.pdfIn PDF document text
- https://cpsguffanti.com/uploads/file/rodolezuvotod.pdfIn PDF document text
- https://quangcaowebsitecomvn.xemlaco.com/uploads/files/87998797796.pdfIn PDF document text
- https://un7un9b3rl1pa7-99.com/contents/files/dapawanorudama.pdfIn PDF document text
- http://tizianaiberti.it/userfiles/files/15732242856.pdfIn PDF document text
- http://icloudcleaners.com/uploads/account/autoresponderfiles/85165213520.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=linux+is+free+and+open+source+softwarePDF 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_off0000b43b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB43B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000cc52.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCC52	10812 bytes
SHA-256: `aefcf9110a295f9431ed1799de36e5482b8a23c006f231453addee2fa684daa7`
`font_02_sfnt_off0000e56c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE56C	14468 bytes
SHA-256: `62cc43f15be6ff7c3db30ac2f93ed04cf6105ee5475005094d07a5ed7961a889`

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