PDF malware analysis — malicious · 7082f6ddfd011abe

MALICIOUS

PDF

83.2 KB Created: 2021-02-17 21:28:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11

MD5: 0bd8d5dac62950c5b4cfbb4b62c89b6f SHA-1: 630a02757820d5cb023087473603a8d1d072b1fa SHA-256: 7082f6ddfd011abe26a4e482a34edcfee575288af5f471e82ed4a6cd5ef6a079

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to 'jacksth.ru' which is likely used to host a malicious payload or redirect to a phishing site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is part of a link farm designed for SEO manipulation or to distribute malware through disposable hosting. Although no scripts were explicitly extracted, the nature of the PDF and the embedded URLs strongly suggest it's used for initial access, likely via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

Heuristics 5

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.
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://jacksth.ru/strik?utm_term=conversor+g%252Fl+a+mg%252Fdl PDF link annotation
- https://static.s123-cdn-static.com/uploads/4385028/normal_5fe3275f3ac98.pdfIn PDF document text
- https://ferateritilew.weebly.com/uploads/1/3/4/2/134265971/zirogevapuv.pdfIn PDF document text
- https://cdn.sqhk.co/nolovojawek/hchfgjF/olympics_2024_paris_logo.pdfIn PDF document text
- http://jezugelevafebir.22web.org/movejotasik.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4478687/normal_5fc8862af167d.pdfIn PDF document text
- https://gemiporelowagi.weebly.com/uploads/1/3/0/7/130775846/5763653.pdfIn PDF document text
- https://cdn.sqhk.co/mujowofapubi/Jg5hbhb/ios_10_screen_recorder_download.pdfIn PDF document text
- https://durabikat.weebly.com/uploads/1/3/4/5/134512276/49bfea9d2ed23d0.pdfIn PDF document text
- https://cdn.sqhk.co/lolatonuvesa/ijihgcQ/vipemewera.pdfIn PDF document text
- https://cdn.sqhk.co/jabuvilir/gR6RrlK/21447515138.pdfIn PDF document text
- http://mscredit.info/vusamif4phhy.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4410447/normal_6017deaec01a0.pdfIn PDF document text
- https://mufusudakewita.weebly.com/uploads/1/3/2/6/132681672/a32a9970.pdfIn PDF document text
- https://gemexufata.weebly.com/uploads/1/3/0/7/130739895/5121f9a.pdfIn PDF document text
- https://vomerigovelaj.weebly.com/uploads/1/3/4/9/134901888/kewunozamiso.pdfIn PDF document text
- https://lefagetali.weebly.com/uploads/1/3/2/3/132302894/1501467.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4386081/normal_5fdd3c0fd86a6.pdfIn PDF document text
- http://xilofomodat.iblogger.org/student_homework_planner_template_free.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.daltonmaag.com/In PDF document text
- http://vewizoxevig.rf.gd/maluvarofodakedanar.pdfIn PDF document text
- http://famuxixisuxu.rf.gd/autodesk_inventor_tutorials_free.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://scripts.sil.org/OFLIn PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d5e0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD5E0	4924 bytes
SHA-256: `41b1b6bd9e88120f2c7951f2e55f05df46bbf17729aa418591ebbcc995c7299d`
`font_01_sfnt_off0000e689.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE689	16556 bytes
SHA-256: `b56baca17ab89e5adbabe2602b09e313b8585ab206b2b6e730f3d888b7069df2`
`font_02_sfnt_off00011a7c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11A7C	16060 bytes
SHA-256: `d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7`
`font_03_sfnt_off00012f14.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12F14	4324 bytes
SHA-256: `1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e`

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