PDF malware analysis — malicious · 63b3b6e91982d018

MALICIOUS

PDF

91.2 KB Created: 2021-10-04 21:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: 4be0b9054327ff2f46aeab3f90ac9582 SHA-1: 93f31e2b625a9e9746d6a0f7e19d566cc99e6181 SHA-256: 63b3b6e91982d018c68f4c2fe2af8e4fdf9e01115a93aef630c67d4f9670973f

166 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous embedded URLs, many of which point to suspicious domains, suggesting a link farm or redirection mechanism. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'SE_QR_LURE' further supports a malicious intent to deceive the user into visiting external, potentially harmful, content.

Machine Learning

Nyx PDF Classifier malicious score 0.9956

Heuristics 7

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.
QR-code redirect lure medium SE_QR_LURE

Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
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 http://aktasmatbaacilik.com/resimlerfiles/66606665852.pdf In PDF document text
- http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/27100148249.pdfIn PDF document text
- http://gr-chem.com/upload/files/tiwegedowunomafoxerabis.pdfIn PDF document text
- https://shevtsov-art.com/uploads/files/96824551586.pdfIn PDF document text
- https://steammining.com/userfiles/file/gijavumavidaratilunel.pdfIn PDF document text
- http://mcserpenti.com/userfiles/file/lovabulukudunu.pdfIn PDF document text
- https://perfecthospital.org/FCKeditor/file/nikobepegijob.pdfIn PDF document text
- https://sokole-tps.pl/userfiles/file/4673786013.pdfIn PDF document text
- http://bloomx.com/sites/all/sites/bloomx.com/files/14381728955.pdfIn PDF document text
- http://vertex-decor.com/userfiles/file/23753551924.pdfIn PDF document text
- https://suksesunited.com/contents/files/33422503549.pdfIn PDF document text
- http://ghalemdi.com/userfiles/file/liwakesomalul.pdfIn PDF document text
- http://saktigroup.in/uploads/38585148028.pdfIn PDF document text
- http://americansemitruckparts.com/d/files/86634789106.pdfIn PDF document text
- http://lynxitservices.com/ckfinder/userfiles/files/jakuwux.pdfIn PDF document text
- http://teplo76.ru/uploads/file/rogokarerokadasumula.pdfIn PDF document text
- http://bertrandetgastineaudesigners.fr/userfiles/file/lupozetupekezokizevebotoj.pdfIn PDF document text
- http://esistore.com/userfiles/file/temixakujusofomifak.pdfIn PDF document text
- http://shippingengineering.com/files/ckeditorothers/sirin.pdfIn PDF document text
- https://cleaner.pl/userfiles/file/ruwoduvusapuporatesa.pdfIn PDF document text
- http://slbreakingnews.com/ckfinder/userfiles/files/90921815010.pdfIn PDF document text
- http://www.amedna.com/userfiles/files/46165935706.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=grow+olive+tree+from+cuttingPDF 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_off0000fe42.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE42	18832 bytes
SHA-256: `1573f8159d4691c3f6ee28a6daa5bd77eb24fd44c6db6f550f536c9e6fd22c09`
`font_01_sfnt_off00012f64.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12F64	10640 bytes
SHA-256: `7413eb2a926d9dced2d500dead13661e5a21ed0378173bf0f66382c2fdb1ed5b`
`font_02_sfnt_off000147d1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x147D1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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