PDF malware analysis — malicious · 7d5e7c490526851f

MALICIOUS

PDF

83.7 KB Created: 2021-09-16 18:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 6f1d5c5ffe3c01636deb237ca12a76b5 SHA-1: abb5557e9499162de02cfda0b87b99fdeb141d82 SHA-256: 7d5e7c490526851f47fe7897171a8568907d8cd2e38717802ef691ef39cd1a05

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it's designed to redirect users to potentially malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic of using many disposable domains to obscure the true malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, likely for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=minecraft+mod+apk+1.16+nether+update PDF link annotation
- http://villapellegrino.it/userfiles/files/48757526658.pdfIn PDF document text
- http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210908_152250.pdfIn PDF document text
- https://egyseg.eu/ckfinder/userfiles/files/62618472132.pdfIn PDF document text
- http://www.travelwithtaangoo.com/img/file/nenepoxozurusuredudewuvu.pdfIn PDF document text
- http://tartak-monis.pl/tartak/images/file/pinanemozetolidom.pdfIn PDF document text
- http://pp-aqua.com/userfiles/files/nikajadapajutonem.pdfIn PDF document text
- https://suprizpin.com/calisma2/files/uploads/12679381026.pdfIn PDF document text
- https://driftwoodcc.com/userfiles/files/xobezowil.pdfIn PDF document text
- http://dichvuhieuchuan.com/upload/files/30744785600.pdfIn PDF document text
- https://brawlcall.jordanadams.com/ckfinder/userfiles/files/valev.pdfIn PDF document text
- http://nepodoshlo.kz/ckfinder/userfiles/files/68423441315.pdfIn PDF document text
- https://hssanesteban.cl/files/sedisafuribuxuvuwawudubef.pdfIn PDF document text
- https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/80106497323.pdfIn PDF document text
- https://dentalrud.com/userfiles/file/mexisifipupidorijez.pdfIn PDF document text
- https://suma.ca/upload/editor/file/13678894830.pdfIn PDF document text
- http://basyapiemlak.com/yukleme_klasoru/userfiles/file/guvugumukexivukikiwuzage.pdfIn PDF document text
- http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/05d8a84ecc00b7993003d0e6565cf634/78647942991.pdfIn PDF document text
- https://biogenetixpharma.com/ci/userfiles/files/wunebodulolo.pdfIn PDF document text
- https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/28740555131.pdfIn PDF document text
- https://kozlovka.mebel18.com/uploads/files/nemixe.pdfIn PDF document text
- http://blow-w124.com/js/upload/files/lokemafufolazufimivoj.pdfIn PDF document text
- http://www.salpasafarit.fi/tiedostot/files/ginezunimagodipebigow.pdfIn PDF document text
- http://an-ocn.ru/ckfinder/userfiles/files/72663069635.pdfIn PDF document text
- http://www.greddy.com/admin/common/ckfinder/userfiles/File/53798838859.pdfIn PDF document text
- http://www.schule.havonix.com/ckfinder/userfiles/files/83493529292.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_off0000df5c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF5C	18408 bytes
SHA-256: `29d8b91364e7cece898e6e6f40a8d1885f1a1ac416fff5deb056ebdb13af61e3`
`font_01_sfnt_off00010ee5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10EE5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000126fc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x126FC	11140 bytes
SHA-256: `c41ae4f174aebaeef155566483bfd91ffdf09c2dbc0fa1aa917aaaccfa837743`

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