PDF malware analysis — malicious · 38c1868b423160ff

MALICIOUS

PDF

76.0 KB Created: 2021-09-12 22:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 603787e3f90deec26e5636600222bc10 SHA-1: a828dbd521cd2b7dbee2d3ed1a26203ae98cc42a SHA-256: 38c1868b423160ff1ea3a860ca841803af9bc67c7cd5ddde62cdc06a766c034e

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external URIs, including one that appears to be a phishing lure related to deleted phone pictures. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of a second-stage payload via the embedded JavaScript.

Machine Learning

Nyx PDF Classifier malicious score 0.9948

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://coretry.ru/uplcv?utm_term=accidentally+deleted+a+picture+on+my+phone PDF link annotation
- http://dokumsuzgec.com/userfiles/files/kakanemakido.pdfIn PDF document text
- http://neboskreb-irk.ru/uploads/userfiles/files/23655397705.pdfIn PDF document text
- https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/25nvhf0ggro51dqkrm3qrl7045/61539115118.pdfIn PDF document text
- https://dichvuketoansg.com/luutru/files/pafejexeropedirezini.pdfIn PDF document text
- https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/vulevobuzawisuzijad.pdfIn PDF document text
- http://bobmeetin.com/media/galleries/files/47284866701.pdfIn PDF document text
- http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/tatef.pdfIn PDF document text
- https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/3bbab89a884138ced2c9471071fb9cf2/98389149879.pdfIn PDF document text
- https://binarbaidtrading.com/public_html/userfiles/file/xavimagiki.pdfIn PDF document text
- http://ccspatti.org/userfiles/file/74510784729.pdfIn PDF document text
- http://pnlestari.com/visitbali/image/files/tidawa.pdfIn PDF document text
- http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/74472009592.pdfIn PDF document text
- http://kanizsakran.hu/userfiles/file/84040787790.pdfIn PDF document text
- http://dj-maily.com/uploads/pages/files/5024949129.pdfIn PDF document text
- http://dr-onesrl.com/userfiles/files/40187977400.pdfIn PDF document text
- http://nicenpos.com/userData/board/file/pefufewukavolulexu.pdfIn PDF document text
- http://www.aamuhsv-madisonalumni.org/files/files/58893444665.pdfIn PDF document text
- http://www.mattig-accounting.bg/fisiere/file/turabivowizamefoxubobili.pdfIn PDF document text
- http://usarsenal.it/userfiles/files/85031534755.pdfIn PDF document text
- http://zechnerbau.at/images/content/files/kawav.pdfIn PDF document text
- http://www.alex-vasilkov.ru/images/wisdom/file/navagesaputunovuse.pdfIn PDF document text
- http://abwclayton.com/uploads/files/10144884633.pdfIn PDF document text
- http://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/50656118355.pdfIn PDF document text
- http://aqs-group.it/userfiles/files/46231120012.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_off0000c4e9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC4E9	10808 bytes
SHA-256: `8455ec50e2f18e6c3feb6697034d4bb5b463c6e1ae0791bda66d6f0a2d87f494`
`font_01_sfnt_off0000dd9e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD9E	17416 bytes
SHA-256: `51e54a08fb34e78dd5a430cd5174eebd6932435c8e5e14077c201b60a7806f26`
`font_02_sfnt_off00010a2b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A2B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

Open this report in the interactive analyzer, or submit your own file for analysis.