PDF malware analysis — malicious · 45f3256312f51744

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 03:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 47faf6e7ea612a53a38c778ed9235e1f SHA-1: c72114b80e26afc01b5e52fe4de9d2d134ce91b1 SHA-256: 45f3256312f517443f2bb66028a3bce7557b1ceb529b0c306c5ca45f442827f7

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

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, with numerous embedded URLs pointing to external sites, many of which are hosted on potentially disposable domains. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://zhuoxinlaw.com/userfiles/file/20210903020113_274089928.pdf In PDF document text
- http://d-a-s.cn/userfiles/file/7866206944.pdfIn PDF document text
- http://osteriadelcampanile.com/userfiles/files/nejezijepafogokofivoroba.pdfIn PDF document text
- http://career-id.org/ckfinder/userfiles/files/pejuvig.pdfIn PDF document text
- https://iword.de/userfiles/file/41609632887.pdfIn PDF document text
- http://reelproductionshd.com/userfiles/file/buzujepaxiduwizu.pdfIn PDF document text
- https://ans5680.preneed91.com/upload/files/wafadakowi.pdfIn PDF document text
- http://asea-admin.com/_userfiles/file/20210908080043.pdfIn PDF document text
- https://www.multilandtours.com/assets/ckfinder/userfiles/files/sitifexerujuz.pdfIn PDF document text
- http://pi-consulting.ch/download/9013343127.pdfIn PDF document text
- https://96662888.com/editor_upload/file/49815236781.pdfIn PDF document text
- https://holycrosshealthcare.com/userfiles/files/62804320058.pdfIn PDF document text
- http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161343af29b4e0---87397714765.pdfIn PDF document text
- http://shahnawazonline.com/uploads/files/wugudizulenuwoka.pdfIn PDF document text
- http://xn--o79av69abka850ab6c.com/upload/file/202109082047465801.pdfIn PDF document text
- http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/62966267065.pdfIn PDF document text
- https://abhimaninteriors.com/ckfinder/userfiles/files/labovot.pdfIn PDF document text
- http://oguraclutch.cn/uploadfile/files/16405416371.pdfIn PDF document text
- http://signauction.net/userfiles/file/rugefolofujojejivi.pdfIn PDF document text
- https://kaptenhoki.net/contents/files/20281982720.pdfIn PDF document text
- https://soechi.net/userfiles/file/16123551872.pdfIn PDF document text
- http://ih-consultant.com/ckfinder/userfiles/files/fomupewunilube.pdfIn PDF document text
- https://laundrybyconrads.com/nbloom/fckuploads/file/zinejobonubal.pdfIn PDF document text
- https://akgoz.zemta.com/uploads/files/tesag.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=spreadsheet+application+examplesPDF 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_off0000deb0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDEB0	15784 bytes
SHA-256: `aaf04fcc8c47bf482edde329cfed0d1b21c0c45d60488f29c44ca0dda86a5da7`
`font_01_sfnt_off0001070b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1070B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011f22.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F22	10956 bytes
SHA-256: `62538490e2a24940d0cffb0d686de2d1df5991fc8867043bc3154cdb226155be`

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