PDF malware analysis — malicious · 7ab081d9e0fd4314

MALICIOUS

PDF

84.0 KB Created: 2021-09-14 05:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 1b83724438cef9d49b065332320714da SHA-1: 36bbfda0a1177a94a34dcb2eb5a0a27a9dc681e6 SHA-256: 7ab081d9e0fd4314ece5bc594e629cc78eb16de670f6e94ca7dbd5912a264730

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous PDF files hosted on various domains, with a prominent lure for downloading cracked software. The presence of external URIs and the overall structure suggest an attempt to distribute malware through deceptive links.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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
Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE

Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
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 http://salukool.ee/upload/userfiles/file/zuguderixal.pdf In PDF document text
- http://4darchitecture.org/img/all/93002554220.pdfIn PDF document text
- https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/kezasur.pdfIn PDF document text
- http://centrlita.ru/archive/image/file/66221708712.pdfIn PDF document text
- http://jfhconsultancy.nl/userfiles/files/lamubefefisofer.pdfIn PDF document text
- https://holocaustresearch.pl/nowy/photo/file/30638125960.pdfIn PDF document text
- http://wangguanhardware.com/userfiles/file/25830356758.pdfIn PDF document text
- https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/23412551078.pdfIn PDF document text
- https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/31751671309.pdfIn PDF document text
- http://thailaundry.com/imgUpload/files/remuzaru.pdfIn PDF document text
- http://sjatupornservices.com/file_media/file_image/file/tobivuvudoget.pdfIn PDF document text
- http://walosports.cl/userfiles/file/pokuguvuratake.pdfIn PDF document text
- https://hyosung-gulf.com/uploads/file/nuvulesodadaza.pdfIn PDF document text
- http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/53298952157.pdfIn PDF document text
- https://mayphotocopydogia.com/upload/files/jefivofidikizugupa.pdfIn PDF document text
- http://srmtteaparty.com/uploads/files/202109030404584691.pdfIn PDF document text
- http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a27ba0f56---sexavulufazusupokokuj.pdfIn PDF document text
- http://herbwaterthailand.com/userfiles/files/javotusike.pdfIn PDF document text
- http://currycornersugarland.com/admin/images/file/53549960091.pdfIn PDF document text
- http://plaschke-partner.com/uploaded/file/belopu.pdfIn PDF document text
- https://equimat-cheval.fr/file/resesiderupifewuzipab.pdfIn PDF document text
- http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/faseju.pdfIn PDF document text
- http://verynailscm.com/user_img/file/79340217871.pdfIn PDF document text
- http://landonintergroup.com/ckfinder/userfiles/files/47821197618.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=download+photoshop+2020+crackPDF 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_off0000e4a8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE4A8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fcbf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFCBF	10808 bytes
SHA-256: `1acb0f428aa6078752db34780ba0ef2a409f2b230cfafa6455e723fcfba18013`
`font_02_sfnt_off000115bc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x115BC	17476 bytes
SHA-256: `c3fa4ff401d75cdf243b8170309e4f26d02642b81ee3d5b8af6099bd7d83b3c2`

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