PDF malware analysis — malicious · 2ffd67c785ee143f

MALICIOUS

PDF

80.8 KB Created: 2021-09-21 00:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 13800dc22105f09f7fea426571089950 SHA-1: b79e474bf53efcca4f57f9772934aba20a269cca SHA-256: 2ffd67c785ee143f7086b664ecd161021b4c133286c35a7814540a505267a5ed

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious or disposable domains, suggesting an attempt to redirect users to harmful content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further indicates a link farm strategy, reinforcing the phishing or malware distribution intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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
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://ariaparvaz.com/basefile/ariaparvazcom/files/89011948463.pdf In PDF document text
- https://kvizek.hu/ckfinder/userfiles/files/88293046424.pdfIn PDF document text
- http://client.diffuse.info/files/98981853454.pdfIn PDF document text
- http://e-photo.lv/ckfinder/userfiles/files/jiwemuperupovonenuwuri.pdfIn PDF document text
- https://greenfins-thailand.org/uploads/file/kalofogiza.pdfIn PDF document text
- https://fotoprint.lv/downloads/file/75555457878.pdfIn PDF document text
- http://santiagoporter.com/js/ckfinder/core/connector/php/files/7592858362.pdfIn PDF document text
- https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/70754406609.pdfIn PDF document text
- http://atol-res.pl/uploads/file/jezipikokodefekawivolukow.pdfIn PDF document text
- https://3rproject.eu/ckfinder/userfiles/files/zukoxasewivofatuja.pdfIn PDF document text
- http://matsusushionline.com/uploads/files/naguxiwimorubafosaliwob.pdfIn PDF document text
- http://www.ciesol.com/ckfinder/userfiles/files/82653565262.pdfIn PDF document text
- https://ural-aiti.ru/admin/ckfinder/userfiles/files/xigebubawazidatetutos.pdfIn PDF document text
- http://drcleancenter.com/uploads/files/202109110812593666.pdfIn PDF document text
- https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/13720697508.pdfIn PDF document text
- https://damiel.eu/userfiles/file/91951256775.pdfIn PDF document text
- http://nationalherbo.com/userfiles/file/54607821284.pdfIn PDF document text
- http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161330bd148a25---37995176595.pdfIn PDF document text
- http://newbusan.net/FileData/ckfinder/files/20210918_61F6F81E13824166.pdfIn PDF document text
- http://stlnsk.ru/uploads/file/55553368591.pdfIn PDF document text
- http://rujiahk.com/uploadfiles/file/woroverudaborap.pdfIn PDF document text
- http://k3projekt.pl/uploads/userfiles/files/25345131495.pdfIn PDF document text
- https://used-machinetools.ro/app/webroot/files/userfiles/files/8114387787.pdfIn PDF document text
- http://vhshf.de/File/93347166309.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=film+fifty+shades+freed+streamingPDF 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_off0000d994.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD994	10772 bytes
SHA-256: `0e03ca408c9a344fd2c31cd4a30210cdbb213bdb675e0b7a21e1236205f2b6f1`
`font_01_sfnt_off0000f1e9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF1E9	16812 bytes
SHA-256: `fa92a3de7dc610359f17b438e43a3519a4321d3dc182ae30e7b963df44a9441a`
`font_02_sfnt_off00011d5c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11D5C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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