PDF malware analysis — malicious · 39cb5fcabd1c0f89

MALICIOUS

PDF

82.7 KB Created: 2021-09-20 12:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 33cd27f9f1356e686851d534ded694fe SHA-1: 300337c557e745488ab31342c27f315eb77256dd SHA-256: 39cb5fcabd1c0f8918c759e1604a0d7a2e748f16fa40719eb94cf08012f2cb4f

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. The embedded URL 'https://coretry.ru/uplcv?utm_term=galaxy+labs+download' further supports this, likely serving as a redirector to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9964

Heuristics 5

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.
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=galaxy+labs+download PDF link annotation
- https://vibangnhadat.com/uploads/files/15310391168.pdfIn PDF document text
- https://etonbio.com/newsLetters/images/file/falitipatijaz.pdfIn PDF document text
- http://jcnjl.com/userfiles/files/puwatajupotixekelevi.pdfIn PDF document text
- https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/2h65lhplrk0fd5ijp43gr4dm62/8191475631.pdfIn PDF document text
- https://www.peltonfell.org.uk/ckfinder/userfiles/files/42187845281.pdfIn PDF document text
- https://gulf-rope.com/images/bulk_images/files/67934379728.pdfIn PDF document text
- http://cyc.cz/pictures/clanky/files/gogulufalex.pdfIn PDF document text
- https://gbp.dropship-online.com/userfiles/files/95550934317.pdfIn PDF document text
- http://dj-maily.com/uploads/pages/files/ronofurepuvonifumi.pdfIn PDF document text
- http://aotwresort.net/ckfinder/userfiles/files/98564216210.pdfIn PDF document text
- https://nonbodepsg.com/uploads/files/54952399934.pdfIn PDF document text
- http://mexxeopaint.com/upload/files/36542510117.pdfIn PDF document text
- http://toyteepee.com/uploadfiles/file/210910083040106392t8s4s0.pdfIn PDF document text
- https://karjerastests.bankai.lv/ckfinder/userfiles/files/fagolewisusebamekezetesa.pdfIn PDF document text
- http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/tokogixow.pdfIn PDF document text
- http://osoboebludo.com/ckfinder/userfiles/files/96962567159.pdfIn PDF document text
- http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2b761f889---83916242149.pdfIn PDF document text
- http://michardardillier.com/ckfinder/userfiles/files/31374891212.pdfIn PDF document text
- https://tourgardan.com/basefile/tourgardancom/files/nekuziluki.pdfIn PDF document text
- https://forexinc.ca/upload/editor/file/84422280603.pdfIn PDF document text
- http://w-mill.jp/images/file/pepabagukodutuxemewirijin.pdfIn PDF document text
- https://mexico-airport-transfers.com/ckfinder/userfiles/files/58406580519.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_off0000d9b3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD9B3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f1ca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF1CA	10300 bytes
SHA-256: `cf5eebfcbfa55d6422a7d85580d539e2e5ff2af80cdd05ae4ffe7a2f6a0f8b16`
`font_02_sfnt_off0001092e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1092E	20164 bytes
SHA-256: `a867758e66abfe4b48d5ccb9c9d60ec95dedd74e151a4fd200f73c35fa9b4d76`

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