PDF malware analysis — malicious · 1b6abc1d7104a1d2

MALICIOUS

PDF

80.7 KB Created: 2021-09-17 05:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: b1e14e5b7dd870acfdf41bed53048a53 SHA-1: b00f2613e5cc22523a5f4a2bb7a12c171bb39d12 SHA-256: 1b6abc1d7104a1d2946e8bd7dcb032f031fe67b707d2ba8b4115123057f11f24

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The presence of numerous external URIs, many pointing to PDF files hosted on various domains, indicates a link farm designed to distribute malicious content. The 'SE_URGENCY_LURE' heuristic suggests a phishing pretext, although the document body itself is unreadable binary data.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

Heuristics 6

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.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161396178269db---venesa.pdf In PDF document text
- http://unseretochter.ch/images/file/28433949794.pdfIn PDF document text
- https://dynasty888.com/image/files/20210911_180224.pdfIn PDF document text
- https://skillmapmagazine.com/ckfinder/userfiles/files/96961901105.pdfIn PDF document text
- http://hit-air.pro/ckfinder/userfiles/files/ronukabufopegivojosubo.pdfIn PDF document text
- https://autoradiator.mn/uploads/ckfinder/files/ladaronagona.pdfIn PDF document text
- http://avvocatoandreabruschi.it/userfiles/files/jakevew.pdfIn PDF document text
- https://www.aaptuk.org/ckfinder/userfiles/files/34100468833.pdfIn PDF document text
- http://aqbnb.com/uploadfile/file/80839662268.pdfIn PDF document text
- http://xn--aknmedcal-wpbe.com/uploads/file/45449297938.pdfIn PDF document text
- http://lgassociates.in/uploads/63491373554.pdfIn PDF document text
- https://ntc-container.com/upload/files/xosiponekukagiletebe.pdfIn PDF document text
- https://movimientofamiliadejesus.com/images/uploaded/file/xamoresowud.pdfIn PDF document text
- http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/meredufejuvepibemawisavan.pdfIn PDF document text
- http://ljjxmining.com/uploadfile/file///2021091600255119.pdfIn PDF document text
- http://enewind.com/pliki/file/63259677252.pdfIn PDF document text
- https://abrasco.org.br/ckfinder/userfiles/files/22368162033.pdfIn PDF document text
- http://cs-golfclub.com/ckupload/files/68515236212.pdfIn PDF document text
- https://cobrawire.com/userfiles/files/sikizufazijanerov.pdfIn PDF document text
- https://dammesliepas.lv/ckfinder/userfiles/files/1835202979.pdfIn PDF document text
- http://factblogs.com/uploaded_files/userfiles/files/jigefipebe.pdfIn PDF document text
- https://reparationmobile.net/userfiles/file/metawiseta.pdfIn PDF document text
- http://tandprotheses.com/ckfinder/userfiles/files/9025419283.pdfIn PDF document text
- http://mn-print.ru/ckfinder/userfiles/files/84275957724.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=8+pool+spin+and+win+hackPDF 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_off0000d542.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD542	10568 bytes
SHA-256: `8e37d1da6f119f35131db5110fc2f50e1af3129eb7f0476e4b6c2c36890f6fff`
`font_01_sfnt_off0000ed4b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED4B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001055d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1055D	18260 bytes
SHA-256: `618e0f71eb420b2cb8ad9a0e71c685a9e0b43e2a94e1fb4b90e373d49265ca58`

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