PDF malware analysis — malicious · a4c9e4f8a431bca0

MALICIOUS

PDF

72.9 KB Created: 2021-09-24 12:37:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 75d7d1d624432e4c89f4260c69e33ff7 SHA-1: d5ba208afc5461743bba45c31844129400205058 SHA-256: a4c9e4f8a431bca05f35f62e4e5587ca2d27b9a61ba92653a4566a1866d7970c

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or exploit vulnerabilities. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host multiple links on disposable domains, a common tactic for phishing or distributing malware. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=where+is+usb+debugging+in+redmi PDF link annotation
- http://wizclub.net/upload/userfiles/file/xikumefofozives.pdfIn PDF document text
- https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/9285886249.pdfIn PDF document text
- http://dulichtantai.com/files/uploaded/files/tifenagejeji.pdfIn PDF document text
- http://nacyc.jp/Upload/file/42949945342.pdfIn PDF document text
- https://avphunter.ro/ckfinder/userfiles/files/xifimebepaxuwozolidonaf.pdfIn PDF document text
- https://ilexgold.com/app/webroot/files/userfiles/files/vumijovubujawebakas.pdfIn PDF document text
- https://rajaunited.com/contents/files/kexibosana.pdfIn PDF document text
- http://fabiocaronearchitetto.com/userfiles/files/bededutero.pdfIn PDF document text
- http://mentor-tutor.com/newGroserLikeProject/uploads/files/sudokiv.pdfIn PDF document text
- https://biserica-izvorul-tamaduirii.ro/files/jasez.pdfIn PDF document text
- http://ahcxdq.com/uploads/file/081137582858.pdfIn PDF document text
- http://zavalinka.by/var/upload/file/86695049043.pdfIn PDF document text
- https://dbmotorbrokers.com/userfiles/file/49607267851.pdfIn PDF document text
- http://alfadent-volg.ru/images_uploads/files/23569313275.pdfIn PDF document text
- http://acsalma.hu/userfiles/files/39207449061.pdfIn PDF document text
- http://quatanggiabao.com/images/uploads/files/18981198493.pdfIn PDF document text
- http://phutungtdc.com/upload/files/tufakeferuxoxutogolirib.pdfIn PDF document text
- http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/5662451840.pdfIn PDF document text
- http://szakkepzosiklos.hu/upload/file/fulorumev.pdfIn PDF document text
- http://beerskiboot.de/img/upload/file/75662982957.pdfIn PDF document text
- http://chiangmai-clean.com/user_img/files/8080246549.pdfIn PDF document text
- https://afraitn.com/basefile/afra/files/56263690942.pdfIn PDF document text
- http://topflexsports.com/uploads/govowuzufukapoz.pdfIn PDF document text
- http://romengo.com/ckfinder/userfiles/files/58002506144.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_off0000b62a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB62A	18428 bytes
SHA-256: `8eecdbc39b7620867c060acbb9f5548cdad2d110bf8a7aabc9a7e651d3ca66e7`
`font_01_sfnt_off0000e6ca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE6CA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000fee1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFEE1	10504 bytes
SHA-256: `f8600363c7aa4d417caf17e8f21dea952d635cd1caadd5e47feefba5e899cf0f`

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