PDF malware analysis — malicious · 636e8bd3a60efc1f

MALICIOUS

PDF

71.9 KB Created: 2021-09-20 00:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 202a98d5c1db4c43c47181eeac200eee SHA-1: 61eab8e31bd835d0decfc81a6fc2554db111ee13 SHA-256: 636e8bd3a60efc1f4983fd6cfef6ab73da89f8c7a3ed5adf09b18d8d70baca3b

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains, indicating a likely attempt to redirect users to malicious content or phishing sites. The presence of embedded JavaScript (T1059.007) is a strong indicator of malicious intent, likely to facilitate further exploitation or redirection.

Machine Learning

Nyx PDF Classifier malicious score 0.9956

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://krisoc.ru/uplcv?utm_term=content+share+android PDF link annotation
- http://china-baby-clothes.com/d/files/nonulijimodalo.pdfIn PDF document text
- http://twgo8.com/uploads/base/files/202109010412142981.pdfIn PDF document text
- https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5ad6ad6e1---40188426734.pdfIn PDF document text
- https://beldaoyun.com/calisma2/files/uploads/26967264600.pdfIn PDF document text
- http://hz-kontejnery.cz/ckfinder/userfiles/files/kudavugokug.pdfIn PDF document text
- https://cingenito.ca/upload/editor/file/13324677368.pdfIn PDF document text
- http://hcbarrett.com/user_area/file/mojexirowegoladepetop.pdfIn PDF document text
- https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/51384959887.pdfIn PDF document text
- http://vocal.bpv.su/content/files/files/86061326483.pdfIn PDF document text
- https://intersensor.ro/v2011/Files/fck_upload/file/kagutolejala.pdfIn PDF document text
- https://yomadesign.com/userfiles/Proj_Name/files/45938198985.pdfIn PDF document text
- http://88cpap.com/userfiles/files/17982637975.pdfIn PDF document text
- http://tupnate.com/ckfinder/userfiles/files/givatunemov.pdfIn PDF document text
- http://jandebruijn.com/uploadimages/files/mulikubulafodumepap.pdfIn PDF document text
- http://www.yemany.com/yemfiles/files/33083237482.pdfIn PDF document text
- http://aleshashop.net/uploaded_files/userfiles/files/7828064726.pdfIn PDF document text
- http://muzycznescyzoryki.pl/userfiles/file/27997294809.pdfIn PDF document text
- https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161419e1709b4c---44452733405.pdfIn PDF document text
- http://health-bridge.in/upload/file/jokupejunufoduvolibasan.pdfIn PDF document text
- https://xyoaa.org/sites/default/files/files/1153603215.pdfIn PDF document text
- http://coimbra.hu/uploads/ckfinder/userfiles/files/fijowekiloxinoxake.pdfIn PDF document text
- https://chachachat.info/js/ckfinder/userfiles/files/65339266575.pdfIn PDF document text
- http://kleinschadenexperte.com/userfiles/file/19897112413.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_off0000ba83.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBA83	10328 bytes
SHA-256: `19ce8c19574dda76c57f5756df0ece2c5cb8b50fd3756067ce92c0caf86ad28a`
`font_01_sfnt_off0000d1ca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD1CA	15768 bytes
SHA-256: `0542b147e0de2cfc4201d6f7aa9ac4bd285de3727b5a873146e09235572a398f`
`font_02_sfnt_off0000fa79.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA79	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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