PDF malware analysis — malicious · 297fa0081f9a7b13

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 02:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: d2167a9a87e9289c639d83c2d284c860 SHA-1: dadaaa6dfa07bba02bf003c71314e5fdda1f3166 SHA-256: 297fa0081f9a7b133bbdbed42eab298ad960246d13728b2082783f3341f29cf0

146 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs and the PDF's structure suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF format itself can execute JavaScript, contributing to the attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9977

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.
QR-code redirect lure medium SE_QR_LURE

Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
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://coretry.ru/uplcv?utm_term=how+to+stop+unwanted+app+installation+in+android PDF link annotation
- http://timebymtm.com/upload/files/lidalolabosokowaduveded.pdfIn PDF document text
- http://kayapalinakliyat.net/file/82343016114.pdfIn PDF document text
- http://detskaoptika.cz/ckfinder/userfiles/files/pipufegudu.pdfIn PDF document text
- https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/resujaxizavedeb.pdfIn PDF document text
- https://macauroommate.com/ckfinder/userfiles/files/tobajavawivuri.pdfIn PDF document text
- https://xnkvinatimex.com/uploads/files/72293403344.pdfIn PDF document text
- http://orem.mn/uploads/files/lidelirakenewezisu.pdfIn PDF document text
- http://climtech.com/files/files/mapebuvorasolokipin.pdfIn PDF document text
- http://elmbbq.com/uploads/files/gorebigejepazutusasonarig.pdfIn PDF document text
- http://vinhosnorte.com/images/files/rujolowuregojakugoxuw.pdfIn PDF document text
- https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/236481ef790e795cab4f6a7951eec86c/baligaxukogifawijel.pdfIn PDF document text
- http://marienoellebermond.com/img/uploaded/file/49062682611.pdfIn PDF document text
- http://chelseacarpet.com/ckfinder/userfiles/uploads/54505479590.pdfIn PDF document text
- https://betsin.org/userfiles/files/kumiloxokogevoverobus.pdfIn PDF document text
- https://grandplaza.bg/uploads/assets/file/fisawotosilutozamo.pdfIn PDF document text
- http://dlabiura.kbo.pl/ckfinder/userfiles/files/kasavunipuwufoli.pdfIn PDF document text
- http://miyozenemeryville.com/uploads/files/sovojupifajamoli.pdfIn PDF document text
- https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c931712bc---47549480513.pdfIn PDF document text
- https://dintek.eu/uploads/file/venituxetaze.pdfIn PDF document text
- http://ecosdaliberdade.com/ckfinder/userfiles/files/18746666800.pdfIn PDF document text
- https://eastmanllc.net/ckfinder/userfiles/files/7970301855.pdfIn PDF document text
- https://thuaphatlaihoanghuy.com/uploads/files/fetotafenet.pdfIn PDF document text
- https://zilalcooling.com/other_files/File/sepumixofibikaxuvogudaro.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_off0000d9a5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD9A5	10564 bytes
SHA-256: `f92b060571e03e191b1ecc82c9d46cab01504369ca51c2b35ca255ae3276d336`
`font_01_sfnt_off0000f1dc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF1DC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000109ee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x109EE	19320 bytes
SHA-256: `a19eabe12327df9a9dbfd99befb483a771dc72829d2c3480055bdea42ec4982c`

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