PDF malware analysis — malicious · 804ee71d0f72feba

MALICIOUS

PDF

85.6 KB Created: 2021-09-23 18:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 8a32b726742e678368103412ee14423d SHA-1: 7fd7c9b499198568ef2d8d37458b5c52cf2c9ee6 SHA-256: 804ee71d0f72feba936c8957b22cfdfd8bc9a72dc8e23333d65d0ff8259903de

146 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and employs a callback phishing lure, suggesting it directs users to fraudulent services or prompts them to call a malicious number. The presence of numerous external URLs, many on disposable domains, further supports a phishing or scam-related attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9970

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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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://nomylo.ru/uplcv?utm_term=the+reluctant+fundamentalist+by+mohsin+hamid+pdf PDF link annotation
- http://bartuceviri.com/userfiles/file/jovuwojogudeberume.pdfIn PDF document text
- http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/wejuposulirakafeso.pdfIn PDF document text
- http://lamekatus.ee/uploads/ckeditor/files/98935472328.pdfIn PDF document text
- https://csp-pub.com/stockages/files/lenujesodup.pdfIn PDF document text
- http://erbamedica.org/userfiles/files/66675984017.pdfIn PDF document text
- http://nhatrangpalacehotel.com/app/webroot/upload/files/34985986513.pdfIn PDF document text
- https://gamepinleri.com/calisma2/files/uploads/mobiti.pdfIn PDF document text
- http://votava2.altrodesign.eu/ckfinder/userfiles/files/duwomoriwazuresojarebupo.pdfIn PDF document text
- https://adlinefor.com/home/webagen/public_html/korn/data/file/70290873917.pdfIn PDF document text
- http://urotunisia.com/uploads/FCK_files/file/93927839104.pdfIn PDF document text
- http://ave-france.com/pics/files/dudifukivenelefozizozit.pdfIn PDF document text
- http://electronicaindex.nl/images/uploads/92580768787.pdfIn PDF document text
- http://isdoor.ru/uploads/files/tujuxalakodu.pdfIn PDF document text
- https://worldmedglobal.com/userfiles/files/tifonevarep.pdfIn PDF document text
- http://www.iciparis.ru/ckfinder/userfiles/files/58570504233.pdfIn PDF document text
- http://le-nora.com/userfiles/file/sebisojuziguganetodavi.pdfIn PDF document text
- http://eastindiaspray.com/suvra/eastindia_spray/files/juvabijuregoxoxufojusopoj.pdfIn PDF document text
- https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ca73a5398---64313958412.pdfIn PDF document text
- https://exam11.menapoint.com/app/webroot/upload/files/5411729908.pdfIn PDF document text
- http://studiorinaldibedin.eu/userfiles/files/70941429130.pdfIn PDF document text
- http://vikingpaint.com/user_file/file/68851659576.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_off0000e571.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE571	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fd88.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD88	11200 bytes
SHA-256: `729a49eecf42d1af2d79e267a7297633309e62d18760d6b8e8d836454e6180b9`
`font_02_sfnt_off00011758.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11758	19224 bytes
SHA-256: `506a889323c097c7f4fd753da89a9acb01a630cff65dc3b5359baeee02ff89ce`

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