PDF malware analysis — malicious · f7492701e5361eb4

MALICIOUS

PDF

77.6 KB Created: 2021-09-16 12:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 35b5f1213308f8eb74fe1ae3a646b1a4 SHA-1: 1d25d59ee3c6d1a8a4c5cbd75c151904510eb970 SHA-256: f7492701e5361eb40c0b2390cbbc98b4a0ab77822e21214dcab3a28da8b14817

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to T1059.007, and the overall delivery mechanism is consistent with T1566.001.

Machine Learning

Nyx PDF Classifier malicious score 0.9893

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 https://desense.eu/uploads/wysiwyg/files/88078793793.pdf In PDF document text
- http://watdoenwevandaag.nl/upload/65808050449.pdfIn PDF document text
- https://norservis.cz/files/files/tilegudevezagovuwegisev.pdfIn PDF document text
- http://ciarajewellery.com/editor_upload/file/19556899904.pdfIn PDF document text
- http://ohmytour.kr/FileData/ckfinder/files/20210908_9622DB0F94E661BA.pdfIn PDF document text
- https://big-affaires.com/img/pics/files/18089727628.pdfIn PDF document text
- http://highlevel.pl/userfiles/file/tebumisefifemamu.pdfIn PDF document text
- https://zhongzing.com/uploads/files/202109112032558576.pdfIn PDF document text
- http://msinziniering.com/userfiles/file/75360078235.pdfIn PDF document text
- http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135596ca8e76---79413536840.pdfIn PDF document text
- https://bepxuyenviet.com/upload/files/gufedebomup.pdfIn PDF document text
- http://studiobonvino.com/userfiles/files/futodovegalamo.pdfIn PDF document text
- https://marjoyunlar.com/calisma2/files/uploads/36307111606.pdfIn PDF document text
- https://theipbuzz.com/images/file/fowopebik.pdfIn PDF document text
- https://ural-aiti.ru/admin/ckfinder/userfiles/files/81403759102.pdfIn PDF document text
- http://kcpsystem.com/userData/board/file/femajobujekazifedewalorum.pdfIn PDF document text
- http://factory-01.com/js/upload/files/vomiji.pdfIn PDF document text
- https://machnhaduong.com/images/uploads/files/kivedoruwugesofelogana.pdfIn PDF document text
- http://es-manzokudou.com/yamituki-n/uploads/files/doxageg.pdfIn PDF document text
- https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/jadebipam.pdfIn PDF document text
- https://chorland-dining.com/webroot/editor-uploads/files/68540938217.pdfIn PDF document text
- https://spotiverify.com/ci/userfiles/files/36589401571.pdfIn PDF document text
- http://goldenstarhotel.vn/images/uploads/files/48073845185.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=free+psp+rom+games+for+androidPDF link annotation
- http://forum-auto.ru/data/files/ritinufasi.pdfIn 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_off0000d4ca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD4CA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ecdc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECDC	16808 bytes
SHA-256: `5bc931c3f05c698de072fe4fb86fac24ac088015493496492714be83445660e3`
`font_02_sfnt_off00011805.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11805	10672 bytes
SHA-256: `42c45df150a6cdd3c36d8dfeb15cdd925984e77c396e8da257910cf07ad72f64`

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