PDF malware analysis — malicious · 79658cb4efb370ac

MALICIOUS

PDF

69.2 KB Created: 2021-10-03 01:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 024c80e1fbf318003927f5b11c04bc58 SHA-1: 573b8b792e799b5d7663680b328f489a7341c0b8 SHA-256: 79658cb4efb370ac2e55b93078e953fefa8905e7cf38e80e4c37b16aa1f9bf81

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and it contains an embedded JavaScript stream. The presence of numerous external URIs, many pointing to disposable hosting, indicates a likely phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9978

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://catamma.ru/uplcv?utm_term=you+never+find+somebody+better+than+me PDF link annotation
- http://abogarestudio.com/userfiles/file/newukukefivununuler.pdfIn PDF document text
- https://ystechpro.com/nbloom/fckuploads/file/33344941992.pdfIn PDF document text
- https://abisspaandboutique.com/nbloom/fckuploads/file/71367916576.pdfIn PDF document text
- https://indiansabroad.uk/userfiles/file/ninavofoposuketirudamanal.pdfIn PDF document text
- https://servingltda.com/userfiles/file/45382804724.pdfIn PDF document text
- https://goldengatetaichiqigong.com/userfiles/file/nasal.pdfIn PDF document text
- http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6jtea6apfldnp27do472h0b9c1/muwabosinod.pdfIn PDF document text
- http://phannhan.vn/files/usersfiles/files/kokefiwuposolanubapasu.pdfIn PDF document text
- https://es21sys.com/userfiles/file/medakiwuv.pdfIn PDF document text
- http://scuderia512.com/js/upload/files/gamujudoledigadifuneje.pdfIn PDF document text
- https://trungtammatnamviet.vn/upload/files/61006519261.pdfIn PDF document text
- http://cngwalk.com/fckeditor/userfiles/image/69875173669.pdfIn PDF document text
- http://propertiesforrent.com/userfiles/file///pumowomusegikagin.pdfIn PDF document text
- http://tc-antey.ru/uploads/files/14449812041.pdfIn PDF document text
- https://playindiano1.in/ckfinder/userfiles/files/vizoj.pdfIn PDF document text
- http://www.naturhalles.fr/fckeditor/userfiles/file/15871480629.pdfIn PDF document text
- http://medrea.ru/upload/files/79313748862.pdfIn PDF document text
- https://smartbrand.ro/mm/file/45113910284.pdfIn PDF document text
- http://erodiertechnik-wenzel.de/userfiles/file/42734520064.pdfIn PDF document text
- https://bienenaktuell.com/sites/bienenaktuell.com/files/file/lokovusuwesetisebefes.pdfIn PDF document text
- http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/58841945823.pdfIn PDF document text
- https://mfdesign.hu/files/file/91103100602.pdfIn PDF document text
- https://varida-tech.com/ckfinder/userfiles/files/62610526796.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_off0000b0df.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB0DF	14684 bytes
SHA-256: `d3a11e7db2c29a963edebfe53abdeaa198c4d9778dd9f32b81b95653812134f9`
`font_01_sfnt_off0000d599.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD599	10976 bytes
SHA-256: `d44fcd16830228e7d914752c4ab4caa9c50e7c98a4b1200a49a432bb6cb58dd1`
`font_02_sfnt_off0000eef2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEF2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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