PDF malware analysis — malicious · 1fda4953d21d0c3c

MALICIOUS

PDF

75.0 KB Created: 2021-10-07 08:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: c07e53f5b99eefee34ea48670471f476 SHA-1: 5dc975324afc2af142a77873047b57c318c16d1e SHA-256: 1fda4953d21d0c3c6bdacea0feb56a7b0831a023894696890d17bfd66eda5d21

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with ClamAV identifying it as a phishing trojan. The presence of embedded JavaScript and a large number of external links, many pointing to disposable domains, strongly indicates a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection or download of malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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 http://aldo-ins.com/userfiles/file/84244788576.pdf In PDF document text
- http://kozelskadm.ru/files/uploads/files/beremegunenadikowavov.pdfIn PDF document text
- http://verypool.cn/images/upload/File/wasizojeburi.pdfIn PDF document text
- http://firmykominkowe.pl/Obrazki/edytor/file/sedulumawowewotug.pdfIn PDF document text
- http://agecarekorea.com/ckupload/files/24032763787.pdfIn PDF document text
- https://himalayanwanderer.com/himalayan/userfiles/files/wogusefir.pdfIn PDF document text
- https://gujaratisamajparis.org/upload/files/79311183513.pdfIn PDF document text
- https://red-adlay.com/upload/files/54096584199.pdfIn PDF document text
- http://normel.org/files/upload/file/51563378041.pdfIn PDF document text
- http://lingvastar.z-i-g-z-a-g.com/userfiles/files/vuwid.pdfIn PDF document text
- http://bezagsecurity.cz/userfiles/poraviditedonizimezot.pdfIn PDF document text
- https://pinpointfeedtech.com/ckfinder/userfiles/files/12403298967.pdfIn PDF document text
- http://kamerton.nl/clientfiles/44285325178.pdfIn PDF document text
- http://engineersclasses4competition.com/files/others/6586820626.pdfIn PDF document text
- http://skolicka.eu/foto/images/file/2532685567.pdfIn PDF document text
- https://ribaczpeter.hu/files/file/kelegavuzo.pdfIn PDF document text
- https://equator-maritime.com/userfiles/file/begidewozelu.pdfIn PDF document text
- https://airshow-bg.com/file/manodozi.pdfIn PDF document text
- https://movie2book.com/userfiles/file/26551755761.pdfIn PDF document text
- https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/pirazisavozulamizemiwa.pdfIn PDF document text
- http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a32913f53a---32716497921.pdfIn PDF document text
- https://damiel.eu/userfiles/file/xukalixizegakoleraredaz.pdfIn PDF document text
- http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/refavun.pdfIn PDF document text
- http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/marurabevetagajinotetiza.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+pressure+is+an+intensive+propertyPDF 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_off0000bde4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBDE4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d5fb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD5FB	10556 bytes
SHA-256: `040b3a14ba66644ecb24f8aef5279c40afc5725178388ee23ccd74e8d1f2f58c`
`font_02_sfnt_off0000ee43.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE43	17752 bytes
SHA-256: `63952655efb6af30ba97a3da0d2add649999940b1d8d3f9c52bbaf458feaa44a`

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