PDF malware analysis — malicious · e5c4e4550ceb70e2

MALICIOUS

PDF

71.8 KB Created: 2021-09-13 04:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: a0bb8e41809e6026852c079fecddb5b3 SHA-1: a34719fb7321ca278088ca0a845a1d4b0ddcabe1 SHA-256: e5c4e4550ceb70e27626e2e41ca0e61297689a7fe222056ff29171ae4fc77228

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, presenting numerous distinct URLs, many of which are also PDFs. The presence of multiple PDF files and the link farm behavior suggest an attempt to distribute further malicious content or phish for credentials.

Machine Learning

Nyx PDF Classifier malicious score 0.9840

Heuristics 5

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.
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://eingangrad.ch/userfiles/files/14434508289.pdf In PDF document text
- http://dintainoodle.com/uploads/files/nenasobesolatawiwibes.pdfIn PDF document text
- https://parlagame.com/calisma2/files/uploads/41079393942.pdfIn PDF document text
- https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/49779942850.pdfIn PDF document text
- https://muzpony.de/obrazki/file/14977538667.pdfIn PDF document text
- http://lnv-cnc.gr/userfiles/file/wozepuwavanawipopuju.pdfIn PDF document text
- http://www.pethouse.es/ckfinder/userfiles/files/8649633605.pdfIn PDF document text
- http://hk-bbc.com/upload/file/nupuwafalowupibazonudit.pdfIn PDF document text
- http://pate4me.com/userfiles/file/73829168191.pdfIn PDF document text
- http://sjanzee.nl/file/roguxobemapewikuvupizuz.pdfIn PDF document text
- http://georgekoldun.com/var/upload/file/jaxatovuxukuf.pdfIn PDF document text
- http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cf32167e2---38828658830.pdfIn PDF document text
- https://getracemirates.com/userfiles/files/nunazulepowisawasevag.pdfIn PDF document text
- http://thepokewave.com/uploads/files/juvuzozir.pdfIn PDF document text
- https://e-ssuances.com/ckfinder/userfiles/files/vebubemawoxetizimelejaba.pdfIn PDF document text
- http://topflexsports.com/uploads/15050821180.pdfIn PDF document text
- https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/47193773138.pdfIn PDF document text
- http://lightofislamonair.org/uploads/files/78866011318.pdfIn PDF document text
- http://gelateriacool.it/userfiles/files/fupuvozu.pdfIn PDF document text
- http://dopuskvsro.ru/UserFiles/2437573488.pdfIn PDF document text
- https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/30716213175.pdfIn PDF document text
- https://giorgiosantinelli.it/file/ratugefabarenimibaguda.pdfIn PDF document text
- https://autoskola-scp.com/files/niwobu.pdfIn PDF document text
- http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b204f9c3f3---54672746805.pdfIn PDF document text
- http://nowator-zpu.pl/userfiles/file/70842382498.pdfIn PDF document text
- https://chrmglobal.com/userfiles/file/33457398300.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=among+us+web+browser+playPDF 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_off0000b908.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB908	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d11f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD11F	10824 bytes
SHA-256: `fb5b56aa9a109895708f9915ff185128c45498e656ae8366f551d6bad18d8e5a`
`font_02_sfnt_off0000e9f7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE9F7	15596 bytes
SHA-256: `f584f9a61168f9f5da060b615419f6e4103a3aec9e9b493575affb1c457eeedb`

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