PDF malware analysis — malicious · b7a4b36f64c6a4ab

MALICIOUS

PDF

75.5 KB Created: 2021-09-10 02:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 11bf07ce97e750a362e530e8094eccee SHA-1: d9bfb230f6dbd2a976cb4c10b4ced2a155ae0d0e SHA-256: b7a4b36f64c6a4abdee25b65bd9626c7b394398b583b513497726693be360898

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics identify it as a link farm on disposable hosting, with numerous external URIs pointing to potentially malicious sites. Although no scripts were explicitly extracted, the PDF structure and the presence of many URLs suggest it is designed to redirect users to external content, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9948

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://queure.ru/uplcv?utm_term=malayalam+dj+songs+mp3 PDF link annotation
- https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/53259478830.pdfIn PDF document text
- http://hsi-international.com/ckfinder/userfiles/files/jipolaguwivevosu.pdfIn PDF document text
- https://millinerandassoc.com/files/file/vujoluluw.pdfIn PDF document text
- https://sausalito.com/wysiwygfiles/file/97276392300.pdfIn PDF document text
- http://hardiebase.com/uploads/assets/filefile/66664871505.pdfIn PDF document text
- http://www.propper-droppers.nl/files/file/xajibubokarefovaxofip.pdfIn PDF document text
- https://812423.qqtogeljackpot2.com/contents/files/34392875448.pdfIn PDF document text
- https://www.area-tlc.com/public/ckfinder/userfiles/files/bujizaro.pdfIn PDF document text
- http://familiegravesen.dk/userfiles/file/70701188280.pdfIn PDF document text
- http://kangshi-you.com/uploads/files/202109100612408130.pdfIn PDF document text
- https://medicentrumnz.eu/medicentrum/files/file/60232480608.pdfIn PDF document text
- http://uniondrygoods.com/fckeditor/userfiles/file/walewujavutulazuzoluku.pdfIn PDF document text
- http://back2wood.de/userfiles/file/67019916532.pdfIn PDF document text
- http://rem-proekt.com/f/file/62492246196.pdfIn PDF document text
- https://pgp-puh.hr/fck_media/file/kepivarajogubelamu.pdfIn PDF document text
- http://wsospice.org/uploads/userfiles/file/file/32553244323.pdfIn PDF document text
- http://gs-metals.com/filespath/files/20210907182251.pdfIn PDF document text
- http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/fesir.pdfIn PDF document text
- https://designsdubaiukfashion.com/userfiles/file/16301742927.pdfIn PDF document text
- http://realtor-madrid.com/uploades/fckeditorfile/8601389126.pdfIn PDF document text
- http://kool-house.com/upload/editor/file/3442099509.pdfIn PDF document text
- http://europavloeren.nl/siteimages/file/jubejuvapodixatuwekivor.pdfIn PDF document text
- http://levne-pohary.cz/UserFiles/File/vabojev.pdfIn PDF document text
- http://ansonseatery.com/uploads/files/lurinarejisuvimipusum.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_off0000bebb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBEBB	10720 bytes
SHA-256: `f007ffdec9320ec63de5556a63354d5a4353d415e387011d9df82b09361135d1`
`font_01_sfnt_off0000d722.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD722	18748 bytes
SHA-256: `abef275128098b344e13113d99e188a8ab7bfce2e8464b060188974be978584d`
`font_02_sfnt_off00010897.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10897	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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