PDF malware analysis — malicious · ae7f279d23e91718

MALICIOUS

PDF

74.2 KB Created: 2021-09-12 01:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 64cc7fea7a8c6779ce3248b92060b8fe SHA-1: a4654983b95a01d46486b39be9f3baea45a2b672 SHA-256: ae7f279d23e917182073fececa26bbfe28d609c482db7db047134d7999900a91

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of hosting multiple small PDFs on disposable hosting, suggesting a phishing or malware distribution campaign. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9976

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://synerhu.ru/uplcv?utm_term=domdomsoft+manga+downloader+apk PDF link annotation
- http://ydchem.cn/filespath/files/20210910011605.pdfIn PDF document text
- http://skoleniridicu-online.eu/ckfinder/userfiles/files/dalotepadorimesa.pdfIn PDF document text
- http://hk-bbc.com/upload/file/jikimagawebipamoz.pdfIn PDF document text
- http://jagdrevier.hu/upload/images/file/50094215147.pdfIn PDF document text
- http://shoreluxurylimos.com/userfiles/files/47460074485.pdfIn PDF document text
- https://gangwontaxi.com/FileData/ckfinder/files/20210908_29AFA7EB24F39DDE.pdfIn PDF document text
- https://takipbizde.com/calisma2/files/uploads/4249035008.pdfIn PDF document text
- http://transcash.com/ci/userfiles/files/kamumimatogemoxir.pdfIn PDF document text
- http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d66e9bf11---19617053964.pdfIn PDF document text
- https://0a3exp.com/upfiles/editor/files/56072924754.pdfIn PDF document text
- http://a-pro-peau.fr/userfiles/file/jofevewoxobud.pdfIn PDF document text
- http://4yoga.by/pics/files/budarilorofewovuwot.pdfIn PDF document text
- http://angerdress.store/ckfinder/userfiles/files/ribamavojexetuwavuwosa.pdfIn PDF document text
- https://badrivishal.com/media/74448866627.pdfIn PDF document text
- http://turbotechnik24.de/userfiles/file/58320021379.pdfIn PDF document text
- http://kimyasaldubeller.com/upload/ckfinder/files/darosipax.pdfIn PDF document text
- http://perfect-gallery.com/userfiles/file/29805905465.pdfIn PDF document text
- http://iact2001.com/userData/board/file/voxefawoburifomesile.pdfIn PDF document text
- http://mfcpavpos.ru/file/damobasutenus.pdfIn PDF document text
- http://amuseonline.com/absite/userfiles/file/17984510659.pdfIn PDF document text
- http://szcftz.com/upload/jepade.pdfIn PDF document text
- https://kawanmto.net/contents/files/23425955285.pdfIn PDF document text
- http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313ef7b65fc---83703074787.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_off0000be78.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBE78	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d68f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD68F	10928 bytes
SHA-256: `0ac4bcaa4d724232f1cfe4335a22c781e212aa0a5811c079a5dda9c6900a7a15`
`font_02_sfnt_off0000efba.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFBA	16732 bytes
SHA-256: `878e9b09b05a336c7c360873ec7b93a7cae0f0e1656f0cf64de32c5e0dfdb23a`

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