PDF malware analysis — malicious · 83b61a3620d046f8

MALICIOUS

PDF

81.7 KB Created: 2021-09-12 04:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 9a93862261368079a763bd97c29e356d SHA-1: e47a7eaf99534670a0e29cd506e6a16b74167ffe SHA-256: 83b61a3620d046f8755f7c3ad24e0179edc04ac0ad3729a524274e0cd04daf9c

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious or disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a large number of links on low-reputation domains, a common tactic for phishing or distributing further malware. ClamAV detection further supports the malicious classification.

Machine Learning

Nyx PDF Classifier malicious score 0.9977

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
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 http://bon-mar.com/fck_user_files/file/verojisu.pdf In PDF document text
- http://iscelenie.info/files/file/kuwezixelolibajijesakenak.pdfIn PDF document text
- https://windfreeklima.com/upload/ckfinder/files/julifozof.pdfIn PDF document text
- http://andreaslasnik.com/data/files/31791004205.pdfIn PDF document text
- https://vaynhanh365.net/contents/files/65211712216.pdfIn PDF document text
- http://juentai.com/userfiles/files/dipivejiworir.pdfIn PDF document text
- http://metabolizmusonline.hu/images/upload/file/lefapekuvebixami.pdfIn PDF document text
- http://secohthailand.com/file_media/file_image/file/37000580563.pdfIn PDF document text
- http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cce9c6c9a---kejotogasezogaveraw.pdfIn PDF document text
- http://metaglas.kr/userData/board/file/74811651866.pdfIn PDF document text
- https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613062cdcbfed---xutipaxufutamejokap.pdfIn PDF document text
- http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f9a704571---76933772672.pdfIn PDF document text
- http://bjjiffy.com/upload/77624028070.pdfIn PDF document text
- http://kcpsystem.com/userData/board/file/wezofupaz.pdfIn PDF document text
- https://standsimulator.com/ckfinder/userfiles/files/43223297809.pdfIn PDF document text
- http://daegyung.kr/userfiles/file/20210910150913.pdfIn PDF document text
- http://sz-nuoyi.com/Upload/file/2021090403194319662.pdfIn PDF document text
- http://www.singchai.co.th/ckfinder/userfiles/files/87636369083.pdfIn PDF document text
- https://aquaprosmart.com/userfiles/files/texepobilupufekub.pdfIn PDF document text
- https://onderdurdu.com/upload/ckfinder/files/zogibugepukowukejunefog.pdfIn PDF document text
- https://www.karelo.com/uploads/File/zifanol.pdfIn PDF document text
- http://smartwealthhk.com/userfiles/ximamumadogedemusumexose.pdfIn PDF document text
- http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/71825301503.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=emoji+keyboard+apk+2019PDF 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_off0000db4c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB4C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f35e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF35E	17324 bytes
SHA-256: `97cac6f6b9496a1c8d3834daa3796bf816480eb8c5f1394caefda2049c8226b1`
`font_02_sfnt_off00011fb3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11FB3	11056 bytes
SHA-256: `c9dbc302d0e13c050aee0215a1b57b665f69356f0ad4ead7f15d151ed3430960`

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