PDF malware analysis — malicious · e16f33d5beaec0a9

MALICIOUS

PDF

79.0 KB Created: 2021-04-05 00:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20

MD5: 0bd1d34fb8bc97b843ef9c44666f1f21 SHA-1: 60f31b8e28b511ecd1f955b09b7bacb1eb4335b5 SHA-256: e16f33d5beaec0a9fd7c7799df3c6e7d782767e71de545bb7d518ff354cd9f2b

194 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ClamAV and a machine learning classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains keywords related to 'pdf windows' and 'wkhtmltopdf', likely to appear legitimate. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

Heuristics 7

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
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.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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://jumiwimov.ru/award?keyword=join+pdf+windows PDF link annotation
- https://cdn.sqhk.co/kuwusemob/kijchgo/visolonos.pdfIn PDF document text
- http://fudoviwil.mywebcommunity.org/vozudesuwexeki.pdfIn PDF document text
- https://kunotokadi.weebly.com/uploads/1/3/1/3/131379116/gutijulub.pdfIn PDF document text
- http://dalovujunaguk.22web.org/granny_mod_apk_invisible.pdfIn PDF document text
- https://poxemolefefax.weebly.com/uploads/1/3/1/4/131407365/6130122.pdfIn PDF document text
- https://nizevamil.weebly.com/uploads/1/3/2/8/132814567/tivexi.pdfIn PDF document text
- https://risegutu.weebly.com/uploads/1/3/4/2/134265716/soromumolirobalixuj.pdfIn PDF document text
- https://cdn.sqhk.co/nupozifulija/egijgiL/fuzur.pdfIn PDF document text
- http://ramuwesitavoz.mywebcommunity.org/34636947240.pdfIn PDF document text
- https://sixofufi.weebly.com/uploads/1/3/4/3/134375841/mujanovumabetuw.pdfIn PDF document text
- http://tofugezupeb.mygamesonline.org/dukaludomewogula.pdfIn PDF document text
- https://cdn.sqhk.co/niwonosorude/gdVAkjb/horizon_zero_dawn_forbidden_west_pc_release_date.pdfIn PDF document text
- https://vebunigujop.weebly.com/uploads/1/3/4/3/134367951/d583536ebc114.pdfIn PDF document text
- http://nelodorofi.iblogger.org/bugutumabadulere.pdfIn PDF document text
- https://fomoxizukewoviw.weebly.com/uploads/1/3/0/7/130739072/doluzuvemenuzisa.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://supajiwa.myartsonline.com/can_mini_splits_heat_and_cool_at_same_time.pdfIn PDF document text
- http://walefusariwe.epizy.com/limebafodekima.pdfIn PDF document text
- http://lanelasopuju.rf.gd/decrease_size_acrobat.pdfIn PDF document text
- http://xogonat.epizy.com/kulok.pdfIn PDF document text
- http://jeduvuvojupan.rf.gd/zezof.pdfIn PDF document text
- http://vabuperupijod.epizy.com/ncaa_basketball_picks_bleacher_report.pdfIn PDF document text
- http://fitewuvo.rf.gd/wijewofefizode.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f705.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF705	4776 bytes
SHA-256: `fcfe5d267e280c6f7a0e6fa7539190321a221f52bc0cf1c72a8274fc6c0a423f`
`font_01_sfnt_off00010776.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10776	11828 bytes
SHA-256: `a66a32ddfffeac59769c1e376d959fd4acfc06eae3469a7493d4a6016376b0c0`

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