PDF malware analysis — malicious · 2acac03754aed1e5

MALICIOUS

PDF

100.5 KB Created: 2021-09-13 01:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 98a20415523e777256d2b154d4f73e00 SHA-1: 20c69bdf850b65562ec5c90059fb0d681a4b028f SHA-256: 2acac03754aed1e53d1b7cc9967a62843feeb03cdff0edb3f3c5b3204d813c31

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. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of numerous external links, including one identified as a link farm on disposable hosting, indicates a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the download or redirection to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9961

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 http://stilistspb.online/public/files/uploads/files/wopejisesodoxotivixogetal.pdf In PDF document text
- http://greensquares.in/userfiles/file///bixug.pdfIn PDF document text
- https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/8da592f0842a867e5893647921950db2/63569956334.pdfIn PDF document text
- http://radiosalsa.fr/php/rs/filesupload/file/33196559867.pdfIn PDF document text
- http://dansecyr.ca/pdf/file/1394764543.pdfIn PDF document text
- https://cfacgroup.com/uploads/FCK_files/file/vajurowaropoz.pdfIn PDF document text
- http://stellarp.com/userfiles/files/peruzavuzamadi.pdfIn PDF document text
- https://kligi.viart.lt/ckfinder/userfiles/files/najenabe.pdfIn PDF document text
- http://gitishahjahanpur.org/ckfinder/userfiles/files/6238467711.pdfIn PDF document text
- https://sportnazona.bg/f/uploads/files/49104578365.pdfIn PDF document text
- http://n2nlah.org/UserFiles/file/57269623440.pdfIn PDF document text
- http://lmtechsolution.com/userfiles/78874146698.pdfIn PDF document text
- http://hyundaidongdo3s.com/images/files/30130508091.pdfIn PDF document text
- https://sunarchegypt.com/userfiles/file/49929384568.pdfIn PDF document text
- http://gowowdeli.com/uploads/files/41764340361.pdfIn PDF document text
- https://emailing-online.fr/uploads/userfiles/file/32068332220.pdfIn PDF document text
- http://araratmebel.ru/img/file/32146156608.pdfIn PDF document text
- http://baobianhkhang.com/upload/files/64817275823.pdfIn PDF document text
- http://asvpp.fr/pdf/jubuzutejelazidekelu.pdfIn PDF document text
- http://ch-yang.com/upload/files/28799336425.pdfIn PDF document text
- http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/vixotidorob.pdfIn PDF document text
- http://xn--or3bo5mvlb.com/data/editor/file/duzakuvofof.pdfIn PDF document text
- http://hflbdq.com/uploads/file/040239272049.pdfIn PDF document text
- https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/327e265f0b052c16354d61f7563b3665/xawovarurumenumixufej.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=into+thin+air+free+pdfPDF 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_off00012362.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12362	18976 bytes
SHA-256: `0aa385219f12a5211926f907aeaeeb65a379392b6d2891401a5bc52c956c9088`
`font_01_sfnt_off000154d5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x154D5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00016cec.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16CEC	10332 bytes
SHA-256: `fc99320b0edc779e3a1d09d5e9659e68c04a25d12482cfac1f21a783eaf3e498`

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