PDF malware analysis — malicious · cde1308f2e461e04

MALICIOUS

PDF

79.8 KB Created: 2021-03-14 11:09:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02

MD5: 4fe2466d8290faf99249b0461dec7731 SHA-1: 4dcdaf6536a2e404914a189584f50430a152dcae SHA-256: cde1308f2e461e04087feccae6d6a7d9bf6280f65a35f1a543858847ff63b314

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm designed for SEO manipulation. The document body, though heavily obfuscated, suggests a lure related to downloading a 'Color atlas of hematology pdf free download'. The primary attack pattern involves tricking users into visiting these links, likely leading to further malicious content or downloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/award?keyword=color+atlas+of+hematology+pdf+free+download PDF link annotation
- http://paselon.getenjoyment.net/russian_beginner_vocabulary.pdfIn PDF document text
- http://makamar.xyz/dacmagic_plus_service_manual7w4eo.pdfIn PDF document text
- http://zaxevef.getenjoyment.net/18431795939.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4385421/normal_5ff1f9bbc906e.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4466675/normal_600c61dd28c1a.pdfIn PDF document text
- http://requiremcgood.com/56742647888nc5b4.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4527357/normal_6010b093e319e.pdfIn PDF document text
- http://help-feedback-amzn6.xyz/masonivakupawiwuwirnoe8p.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://wexejof.epizy.com/96236574944.pdfIn PDF document text
- http://walusapo.epizy.com/greek_mythology_books_for_high_school.pdfIn PDF document text
- https://2e6726a7-2e78-456a-9fa1-8bc85c3b20a6.filesusr.com/ugd/76e31d_5b24ec2a6d4946a4b078f40cd1ade3ac.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/fdd46333-9dc9-43c0-8568-63defb478c4d/how_to_extend_my_cdl_permit.pdfIn PDF document text
- https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_84ea7951cd30499d8f255c9498377323.pdf?index=trueIn PDF document text
- http://pulaxemafuzizum.epizy.com/lebanon_nh_weather_report.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/0fa1269c-2cef-4ddb-87d9-5622ff815600/a_simple_favor_book_sequel.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/7fcf3d86-bf65-48fa-850f-4f2ce0dfde98/4_pics_1_word_answers_8_letters_teeth.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/fad3ea0a-506d-448a-bad3-31a45eb15c3c/percy_jackson_film_online_cz_titulky.pdfIn PDF document text
- https://391e4f24-9fc9-4707-ac06-338edcd9f959.filesusr.com/ugd/110ef3_e8488778a3344530a8e2e61e43eb06f1.pdf?index=trueIn PDF document text
- http://xazulagevam.rf.gd/adjectives_with_meanings.pdfIn PDF document text
- https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_f4e1f1c747e744a9ad883ce2b5a188a6.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_off0000ebc0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEBC0	5412 bytes
SHA-256: `49525acc148428e3895db21242c30389a23afff43733f47b5fa1a337e649e62e`
`font_01_sfnt_off0000fe18.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE18	10876 bytes
SHA-256: `7b530977ae554999214ab53ae7737cb4b8740ffe7eae9512df6f4e1b8625b527`
`font_02_sfnt_off00012356.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12356	4324 bytes
SHA-256: `1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361`

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