Malicious PDF — malware analysis report

Static analysis result for SHA-256 96a4ea6842a4ee69…

MALICIOUS

PDF

87.0 KB Created: 2021-03-08 05:21:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 0b89a804eda2760d0a0b889192f387c6 SHA-1: c53a7edde95433f97ae22a6ff8d4b4e7b7c72e69 SHA-256: 96a4ea6842a4ee6938378172bc3cf42bc1edb84e0ddb59a8e61bc09de407ca6e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an external URI pointing to a suspicious domain, identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://kuzutuzo.ru/strik?utm_term=advanced+engineering+mathematics+erwin+kreyszig PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4381544/normal_5feef66c7e56c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386607/normal_5fc7798799517.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486550/normal_600a157ab5f4f.pdfIn PDF document text
    • http://dexujin.iblogger.org/75832969034.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369304/normal_6020d92726c42.pdfIn PDF document text
    • http://mitidogifomasis.iblogger.org/german-_english_technical_dictionary_free.pdfIn PDF document text
    • http://vufepeb.22web.org/xigavozategoxorutewusevow.pdfIn PDF document text
    • http://gotiwekiz.iblogger.org/zulit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408187/normal_5ff90f06db7e9.pdfIn PDF document text
    • http://lesalufijo.iblogger.org/reportable_fringe_benefits_adjusted_taxable_income.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417997/normal_600c71f0cdbf4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487903/normal_5fc85ee1d627e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368742/normal_60068dcb7eb7f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447253/normal_5fe0fc39cac4f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/spider_man_hd_wallpapers_1080p.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/utorrent_movies_free_for_android.pdfIn PDF document text
    • http://rozopujonabesix.epizy.com/38672104391.pdfIn PDF document text
    • http://vevosewis.rf.gd/jewesujatuzivufoveraw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64421489-3fa6-4e28-8c0f-bdfd5c974d0a/79562553412.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3b03a35-d2b1-4a5c-863c-15b7e0d6f31e/33354417141.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92d271cd-adc9-456d-b94f-e45abeec5f69/15232856603.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/29401953469.pdfIn PDF document text
    • http://lanikudawojag.rf.gd/setoza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e94d7df7-a322-4d1c-a6ec-e93beb4b6d76/vegan_cookbook_for_athletes.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/game_god_of_war_4_psp.pdfIn PDF document text
    • http://diverozisutujew.epizy.com/csf_analysis_normal_report.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.

FilenameKindSourceSize
font_00_sfnt_off0000f78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78A 2888 bytes
SHA-256: c82bebd4b493aaaf84143f05ff6967641e6933e4069ecd51460b008fb5b9cf8a
font_01_sfnt_off000101ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CA 5676 bytes
SHA-256: 9854dfb3a89266c593b0fd506a76c54d993b30d8508faa7b1870bd0b2025496b
font_02_sfnt_off0001151d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151D 10364 bytes
SHA-256: b0cc4e49f855a57e3e94854875f3518b95eb1705c348be5752d7f0c76cc5dfce
font_03_sfnt_off00013874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13874 16080 bytes
SHA-256: 43edd991dd82ac0fa2eca9b739274f2e51255dde0463e5ab0a893647ae73f153

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