PDF malware analysis — malicious · 1b3a22b43ebe1b13

MALICIOUS

PDF

71.5 KB Created: 2021-09-25 03:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 8cb2d2f1eb8bd64fb2c87d5cd5a7ec22 SHA-1: 3af0298b2f0dd270ba47b7bef422e34b29fddb89 SHA-256: 1b3a22b43ebe1b130f6e7e86a48eb61d43e8c5a50cd36a32ec8ce036222d3bf8

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, a common technique for delivering malicious payloads. The presence of a link farm with numerous disposable hosts suggests an attempt to obscure the ultimate destination of the malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation for client execution.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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 http://msinziniering.com/userfiles/file/fajiketezavakuxabo.pdf In PDF document text
- https://culturasiapamplona.com/guiarte_userfiles/files/torofeni.pdfIn PDF document text
- http://wenxuezj.com/images/File/rimelawasasawapevufi.pdfIn PDF document text
- http://animationcoach.com/userfiles/file/21895480102.pdfIn PDF document text
- http://merlegdoktor.hu/tmp/jevatulaweziturof.pdfIn PDF document text
- http://farmaciacogliate.it/userfiles/files/nixinotabuzoviwoleronavov.pdfIn PDF document text
- https://ssekolkata.com/ckfinder/userfiles/files/fomefeweto.pdfIn PDF document text
- https://dafelia.com/files/bisewidezexodiveb.pdfIn PDF document text
- https://signatureshreyas.in/userfiles/file/molujudu.pdfIn PDF document text
- http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614e185b03894---90568201262.pdfIn PDF document text
- http://flagrant-desir.com/userfiles/file/42669106674.pdfIn PDF document text
- http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210914174315.pdfIn PDF document text
- http://waterlootour.com/FileData/ckfinder/files/20210913_18B8B080E0FAB071.pdfIn PDF document text
- https://hoatuoi360.vn/uploads/files/larajovu.pdfIn PDF document text
- https://redac.ch/upload/sajejabijas.pdfIn PDF document text
- http://alde-pace.org/ckfinder/userfiles/files/muzoxogebapigekanugix.pdfIn PDF document text
- http://snap-drone.com/userfiles/file/32744876829.pdfIn PDF document text
- http://mundori.com/js/ckfinder/userfiles/files/weravalusevofi.pdfIn PDF document text
- https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/e2c42427d3891a81256fbe73938af9e6/pimemozubopebezuwekixaw.pdfIn PDF document text
- http://heatexchangersolution.com/upload_fck/file/2021-9-14/20210914081129382820.pdfIn PDF document text
- http://infracsap.hu/files/file/69346211142.pdfIn PDF document text
- https://almavilag.hu/files/files/75497338757.pdfIn PDF document text
- http://abw10thstreetne.com/uploads/files/tawogubifatuge.pdfIn PDF document text
- https://fetogram.ir/images/upload/files/81380436480.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=android+adjust+brightnessPDF 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_off0000b521.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB521	10832 bytes
SHA-256: `55c92f0e0a0c312b64d1b1cc9fe633699b61fcfa2e33ec87d9e94046e0ffc0af`
`font_01_sfnt_off0000cdd0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCDD0	16828 bytes
SHA-256: `31d4c6d84d3403300547649046c25e93202a7d2615efb95feeca61dc6b353e5f`
`font_02_sfnt_off0000f8b5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF8B5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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