PDF malware analysis — malicious · c1448931f3672506

MALICIOUS

PDF

80.6 KB Created: 2021-09-30 22:37:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 006e03371fb3da1449da30048fae6de5 SHA-1: 27d4211dccb7b366a6bf1deb29f499b1eabf1d60 SHA-256: c1448931f3672506c57325e91f371deaaa40b47b03881a4bbf5fde463a62bcdc

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, reinforcing the phishing or malware distribution vector. No scripts were extracted, but the overall structure and URL distribution strongly suggest a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 5

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.
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://akcihlar.cz/userfiles/file/96238193973.pdf In PDF document text
- http://jamesandsons.ca/userfiles/file/datidizudodadabax.pdfIn PDF document text
- https://www.piramideidiomas.com/ckfinder/userfiles/files/43729006418.pdfIn PDF document text
- https://arte-salon.ru/upload_picture/ferudoru.pdfIn PDF document text
- http://abwgulfport.com/uploads/files/31493270546.pdfIn PDF document text
- http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_02_03_27_21_5559.pdfIn PDF document text
- http://jagodkaprzedszkole.pl/userfiles/file/77644428843.pdfIn PDF document text
- https://sanaspinler.com/calisma2/files/uploads/89443259428.pdfIn PDF document text
- http://khamranghaiphong.com/upload/files/89153788434.pdfIn PDF document text
- http://vietsaovang.com/uploads/userfiles/file/vumerezixoguduguxugosurex.pdfIn PDF document text
- https://slavicchurchmississauga.com/fck_upload/file/4754100437.pdfIn PDF document text
- https://gallerylingard.com/uploads/file/mawamer.pdfIn PDF document text
- http://naturabliskociebie.pl/userfiles/file/najafasutikusamulev.pdfIn PDF document text
- http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc5d3b7cf9---74588844755.pdfIn PDF document text
- http://wsystem.sk/userfiles/files/gulelunizasexulebutan.pdfIn PDF document text
- http://cuakeobinhduong.com/upload/files/banidefitupu.pdfIn PDF document text
- http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135d5393eaa8---99829551818.pdfIn PDF document text
- http://fueandhair.com/userfiles/files/seguruludi.pdfIn PDF document text
- http://jfac.kr/ckfinder/userfiles/files/80915234375.pdfIn PDF document text
- http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/1627087756.pdfIn PDF document text
- https://lux-ride.com/home/u4-6pzgszajsb5u/www/lux-ride.com/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/kabixugu.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=speakout+elementary+pdfPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000b659.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB659	22440 bytes
SHA-256: `92db253645a6fb3dd948ec8fb46825baf45948bb43ce60184e2a3cb0be4c00a7`
`font_01_sfnt_off0000ed95.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED95	10780 bytes
SHA-256: `ddb2e78f091b9709fc7cb3740686b2ebde48abf15947aa3a9b80d894d8c43f8c`
`font_02_sfnt_off00010675.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10675	16244 bytes
SHA-256: `fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d`
`font_03_sfnt_off00011c63.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C63	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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