PDF malware analysis — malicious · eacbc898643e87fa

MALICIOUS

PDF

77.2 KB Created: 2021-09-11 16:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 264f665394d3f598054e5be0e4ab22ea SHA-1: e44547e3d3186f6d26a7d979413cf49ab1da944f SHA-256: eacbc898643e87fae425e162122a22667f23b6a994bc27c4a685262901d422b1

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URLs, many hosted on disposable domains and utilizing UTM parameters, strongly suggests a phishing or malware distribution campaign. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of a trojan or phishing payload being delivered.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

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://allytemp.ru/uplcv?utm_term=worms+zone+io+apk+mod PDF link annotation
- https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/i1vm1h28hfipbbifsoufc28klm/ximusupewamudodawe.pdfIn PDF document text
- https://jagamimpi.info/contents/files/jinukopepojomakojotudibeb.pdfIn PDF document text
- https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/nafufut.pdfIn PDF document text
- https://specialgarden.ro/userfiles/file/tovikemawake.pdfIn PDF document text
- http://a2kat.ru/userfiles/file/53154314427.pdfIn PDF document text
- http://comitatoamiantovelodromo.org/userfiles/file/26500324393.pdfIn PDF document text
- http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20014583837.pdfIn PDF document text
- http://metalzilemboeventi.com/userfiles/files/xavofuluwimepagogiva.pdfIn PDF document text
- http://hflbdq.com/uploads/file/090628462417.pdfIn PDF document text
- http://aaaexpressheating.com/userfiles/file/gevifimazaf.pdfIn PDF document text
- https://szaniterplaza.hu/ckfinder/userfiles/files/68933826179.pdfIn PDF document text
- https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/4fa51e4a164e5b5a6c774c333742ff35/tavewutix.pdfIn PDF document text
- http://ikuma-car.com/js/upload/files/fowarowozelututugololavuf.pdfIn PDF document text
- http://rilta.net/userfiles/files/tuzimotemeviluseluvuk.pdfIn PDF document text
- http://canyonmeadows.org/userimages/zobozizatifanos.pdfIn PDF document text
- http://usmleworkout.com/files/file/53398678604.pdfIn PDF document text
- https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/viguma.pdfIn PDF document text
- http://myphamlulanjina.com/upload/files/61203117823.pdfIn PDF document text
- http://dhf-china.com/d/files/12124666273.pdfIn PDF document text
- http://lanaecoloridabruzzo.it/userfiles/file/fuwawitizomepipati.pdfIn PDF document text
- http://mediaworld.pro/ckfinder/userfiles/files/20393986171.pdfIn PDF document text
- https://ketex.com/trcgp/ckfinder/userfiles/files/73775055715.pdfIn PDF document text
- http://pagyesa.org/userfiles/file/20210903195952.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_off0000c8d3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC8D3	10552 bytes
SHA-256: `d33c7c130b5627034ec4389ae37099dd24d0e792dee165aaa7fc30780f208665`
`font_01_sfnt_off0000e0e6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE0E6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f8f8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF8F8	18224 bytes
SHA-256: `dfc1a0e189a3619d64b5fedc77fc3b9ea23d84033d2b604778a2f915f640e544`

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