PDF malware analysis — malicious · dc5636951a98fb53

MALICIOUS

PDF

83.1 KB Created: 2021-09-23 21:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: edac8eb6b4a2a8d52ff6e19c161fb807 SHA-1: ba4d5a91f7d1851eaecc928f9013765b03ea9655 SHA-256: dc5636951a98fb53f41f54fc03b3c5fbba32a4b13ca88f14fbadb04737155ff4

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The PDF's structure and the presence of external links point towards a phishing or malware distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=how+to+fix+mobile+keyboard PDF link annotation
- http://kingbikeonline.com/images/upload/File/tunupokabuvef.pdfIn PDF document text
- http://rm-centr.ru/uploads/file/bomasux.pdfIn PDF document text
- http://rc-modeller.se/images/file///dabuziror.pdfIn PDF document text
- http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e294ecc9eb---jujogubotu.pdfIn PDF document text
- https://przyklejki.pl/userfiles/bejajujigokinusutuzife.pdfIn PDF document text
- https://globalathena.com/ckfinder/userfiles/files/natiwewekizabironu.pdfIn PDF document text
- http://9y.bfage.com/upload/files/20210913192316.pdfIn PDF document text
- https://reaga.net/js/ckfinder/userfiles/files/penurapemuxadumosuxez.pdfIn PDF document text
- http://mastera-mix.ru/ckfinder/userfiles/files/51569329116.pdfIn PDF document text
- https://beautydent.hu/editor_up/wogigamovezibat.pdfIn PDF document text
- http://jucal.es/images/file/jesikavudelidimusobajin.pdfIn PDF document text
- https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/5734557094.pdfIn PDF document text
- http://farashimirooz.com/files/mamax.pdfIn PDF document text
- http://mingmitrcoffee.com/user_img/files/vivotovogozesuxov.pdfIn PDF document text
- http://hferrynetworks.com/FileData/ckfinder/files/20210907_DB726725A7C2B287.pdfIn PDF document text
- https://rmp-familienanzeigen.de/cms/files/43484877654.pdfIn PDF document text
- http://hoangnamjsc.com/upload/files/gasowodixigebus.pdfIn PDF document text
- http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130f897e2c9d---limunevalofebu.pdfIn PDF document text
- http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60550842734.pdfIn PDF document text
- https://pacantioquia.org/aym_image/files/78554862088.pdfIn PDF document text
- https://binarbaidtrading.com/public_html/userfiles/file/xavimagiki.pdfIn PDF document text
- http://hwayoung.kr/upfile/files/21404033634.pdfIn PDF document text
- http://magooferta.pl/uploads/fck/file/pesisamukurepuwibolir.pdfIn PDF document text
- http://przychodnia-felinskiego.pl/uploads/editor/file/29921622757.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_off0000dbcc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDBCC	19848 bytes
SHA-256: `c433e4e901fc6cb64325ac541d1f6f3d85070fe6776b49fbb652b4ba0915846f`
`font_01_sfnt_off00010dd1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10DD1	10768 bytes
SHA-256: `40c5fd2edf33408d1640186e32dff4485c6d7e4721b9a5ed19d831fe29b17961`
`font_02_sfnt_off000126a5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x126A5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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