PDF malware analysis — malicious · 18cd51a292e88e3e

MALICIOUS

PDF

88.8 KB Created: 2021-03-25 16:59:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21

MD5: c01ed7e1d0b8063ec199b46bdb2bd2a3 SHA-1: 1a52587ba4136874227f4d8a1678690b0c4d537a SHA-256: 18cd51a292e88e3e715685a2668109bac1ac2a0942de51bd45f7e764ae342e4a

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains multiple external links, including one hosted on a disposable domain, suggesting a phishing or redirection attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, and the ML classifier strongly flags this PDF as malicious. Although no scripts were explicitly extracted, the presence of numerous URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

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.
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://baarspo.ru/123?utm_term=council+of+exarchs+rep+guide PDF link annotation
- https://togodinaxudare.weebly.com/uploads/1/3/1/6/131637070/8b8e2c9af813d20.pdfIn PDF document text
- http://vaxenovutejuzid.sportsontheweb.net/caribbean_princess_deck_plans.pdfIn PDF document text
- https://cdn.sqhk.co/dogojaseziwo/9zprhcU/xoludomukejar.pdfIn PDF document text
- http://gizigevom.mygamesonline.org/rozowoxetiweturolirisiger.pdfIn PDF document text
- https://cdn.sqhk.co/letarezetap/hbibhgc/87528995614.pdfIn PDF document text
- http://pelinebaj.mypressonline.com/carcassonne_traders_and_builders_rules.pdfIn PDF document text
- https://duroxogudoli.weebly.com/uploads/1/3/4/3/134318703/5161242.pdfIn PDF document text
- https://zugasemoz.weebly.com/uploads/1/3/4/5/134593751/ed7667d75f69.pdfIn PDF document text
- http://kunutudusoxa.mywebcommunity.org/wupivobotakuzizojifag.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://todiwefexoneb.atwebpages.com/begijeniwemitemifola.pdfIn PDF document text
- https://s3.amazonaws.com/fifuto/77336750819.pdfIn PDF document text
- https://2dc0326d-ac60-47d8-bf46-f2dc9d334570.filesusr.com/ugd/21b4a7_a8159b4337e042c7b3ea6872e4399ed7.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/regegozumekoza/moradezupanabivuto.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/171c1d99-86b4-45cc-901c-822e915f2b1a/24352604141.pdfIn PDF document text
- https://s3.amazonaws.com/tigewibejageju/client_service_manager_interview_questions_and_answers.pdfIn PDF document text
- https://s3.amazonaws.com/zolerazowubow/27390061632.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/adda83f2-4bb5-475b-8fc2-51e8874902f5/how_do_i_share_a_memory_on_facebook_to_my_story.pdfIn PDF document text
- https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_8f5b8e3946bb4508865c4e00848439ee.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/befarekogol/max_brightness_app_android.pdfIn PDF document text
- https://2065f6f1-29fb-48ac-a230-4f4ab2d4b746.filesusr.com/ugd/b62953_f94a9b8b6a60460b9e702a6774f1dc8b.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f21a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF21A	13976 bytes
SHA-256: `6948e9c168494caf73eda08a7f8d994b9458e46f8c908f503d6857e209364a29`
`font_01_sfnt_off00011ca4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11CA4	5392 bytes
SHA-256: `e2a3f914a92e8af083b369f7d3d5ee286006790f11c05eceb203ebd9639356d8`
`font_02_sfnt_off00012ef8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12EF8	10532 bytes
SHA-256: `5bbc661360dd7c99bfa7f2b1281399dc68ce5dcd957084ff801c3d89e378e58e`

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