PDF malware analysis — malicious · 86d46eb8281696e1

MALICIOUS

PDF

85.9 KB Created: 2021-09-10 16:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: d03ee253b86821daa943745539e76d69 SHA-1: f04194e30980ebfd8c01322feddede94e89da30a SHA-256: 86d46eb8281696e1ad0d9105c2541451d4753587d91fb4a870e63ca4507118e9

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to distribute links to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9922

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 http://adbuilder.at/ckfinder/userfiles/files/laxilamitokivufofeti.pdf In PDF document text
- https://lawrenceyezersky.com/userfiles/file/rumojanetidafodanasuridew.pdfIn PDF document text
- http://vimar.ua/userfiles/files/mugusavibope.pdfIn PDF document text
- http://bastola.org/userfiles/file/58632474981.pdfIn PDF document text
- http://www.sctiec.com/up_files/FCK/file/35975589426.pdfIn PDF document text
- http://uchid.com/uploads/file/5776675665.pdfIn PDF document text
- http://progettocecinacuore.it/writable/public/userfiles/file/mazuwuletorires.pdfIn PDF document text
- https://vasantviharproperties.com/userfiles/file/52115717342.pdfIn PDF document text
- https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffbc8cd60e---bakujugodapogejusolekekos.pdfIn PDF document text
- https://hinaweb.com/upload/file/89283352110.pdfIn PDF document text
- http://bbmpva.nl/fckassets/file/40159745435.pdfIn PDF document text
- http://zechnerbau.at/images/content/files/35249154953.pdfIn PDF document text
- http://aapltd.net/userfiles/file/35369973060.pdfIn PDF document text
- http://www.s-prom.si/fileupload/file/96836116924.pdfIn PDF document text
- https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/42a3370b47213c7b8ba1f65b58fbf88f/xurovawud.pdfIn PDF document text
- http://trivio.it/userfiles/files/76741489079.pdfIn PDF document text
- http://firesecurity.sk/userfiles/file/dosudug.pdfIn PDF document text
- http://jagatjyotischool.org/jagatjyotischool/userfiles/file/8848874003.pdfIn PDF document text
- http://bcslaw.hu/admin/fck_upload/file/zujowasefezixotokazima.pdfIn PDF document text
- http://kalkulacka-hypo.cz/userfiles/files/norasizar.pdfIn PDF document text
- http://medical-1669.com/userfiles/files/zakudurididaku.pdfIn PDF document text
- http://zatuchlina.cz/upload/file/98917910590.pdfIn PDF document text
- https://elperrocallejero.info/ckfinder/files/zadarolopiwiteruzoso.pdfIn PDF document text
- https://pvcmikser.com/upload/files/50505509873.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=kung+fu+all+star+mod+apkPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_005_off00012f25.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x12F25	17604 bytes
SHA-256: `ea011e1c0351a50db80e85e3fc21091a212ceacb90e1a6c1cd6cb88e93ca6279`
`font_00_sfnt_off0000c65f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC65F	10800 bytes
SHA-256: `82d619ad1be5bbf97acecf84ab5bca7575d106ff8b33791b9cf08f00fd0ebcb3`
`font_01_sfnt_off0000df17.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF17	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f729.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF729	22704 bytes
SHA-256: `fb8d7622954704437413c41eba72952c2abdbf858f8b23df7ef6d736f797dd72`

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