PDF malware analysis — malicious · af184c257c83c008

MALICIOUS

PDF

82.0 KB Created: 2021-09-24 04:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 05cbd9f7f9b1b8ec429348e994a27023 SHA-1: 634c18a2e17f1ef97ec75e3198c8fb2170ccd14f SHA-256: af184c257c83c008b9d140d686d9d1c807698b33030375171edbcb3bf7e8b62f

166 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm and employs a social engineering lure to trick users into installing a browser extension or update. The embedded URLs likely lead to further malicious content or downloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9972

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
Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE

Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
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://ketchas.ru/uplcv?utm_term=best+lightweight+pdf+reader+windows+10 PDF link annotation
- https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/c9d75d1a0ed55b2987f3beff45e355c5/65266344535.pdfIn PDF document text
- https://rumputhijau.com/contents/files/64859905115.pdfIn PDF document text
- http://zeroseistudio.eu/userfiles/files/97399724118.pdfIn PDF document text
- http://loaamtran.com/files/usersfiles/files/pofivofir.pdfIn PDF document text
- https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/puzimoboxodofeje.pdfIn PDF document text
- https://aimtronu.org/userfiles/file/lijatajobizososukomas.pdfIn PDF document text
- http://fuguchair.com/upfolder/e/files/20210903013648.pdfIn PDF document text
- https://perfecthospitals.org/ckfinder/userfiles/files/jogigabifazobavak.pdfIn PDF document text
- http://dlugopis.kbo.pl/ckfinder/userfiles/files/86013061655.pdfIn PDF document text
- https://strategieb2b.com/userfiles/file/82937518930.pdfIn PDF document text
- https://vidaleve.net/ckfinder/userfiles/files/dilurakaresuwasum.pdfIn PDF document text
- http://candleelectricals.com/uploaded_files/userfiles/files/bogamabe.pdfIn PDF document text
- http://simsvizag.com/contentimages/file/63716738996.pdfIn PDF document text
- https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/zuwaz.pdfIn PDF document text
- https://incense888.com/uploads/files/202109021019272699.pdfIn PDF document text
- http://architettoannalisatinelli.it/userfiles/files/buposepisal.pdfIn PDF document text
- http://fermobkorea.com/userfiles/file/20210910235351.pdfIn PDF document text
- http://barahi.com/assets/userfiles/files/wisirenun.pdfIn PDF document text
- https://cuatudongsaigon.net/uploads/files/jagutepebuteganojesipu.pdfIn PDF document text
- http://safiorida.dk/operatori/userfiles/file/felojozijep.pdfIn PDF document text
- http://architettosbaffo.com/userfiles/files/gobotamaxezu.pdfIn PDF document text
- 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_off0000de75.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE75	11092 bytes
SHA-256: `a3eef6e67409609059e59477dd5aab0a017fb569a316fa30b449a54ac2def182`
`font_01_sfnt_off0000f825.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF825	16564 bytes
SHA-256: `bf879f4f255543eb7d68c044ee3901216d7bd2da3899331aae12dd7bd90d6e77`
`font_02_sfnt_off000122e0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x122E0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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