Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e28d7c440f44262…

MALICIOUS

PDF

82.2 KB Created: 2021-05-15 18:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a9002ba9022528ec208f68a799f9840f SHA-1: 7a73b056855a628fd4037ec7221a44f2078da927 SHA-256: 5e28d7c440f442621aad64a5fd4bd6537f7019f7dbf97fac654ee396c1d67643
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://xajibur.ru/strik?utm_term=5th+wave+2nd+book PDF link annotation
    • https://rewodudifizaba.weebly.com/uploads/1/3/4/4/134475466/sibibasejetifep.pdfIn PDF document text
    • http://verifiedbadges-form.com/fantastic_mr_fox_ash_redditk3e5r.pdfIn PDF document text
    • http://xepusuxewo.iblogger.org/punctuation_worksheets_for_class_5_with_answers.pdfIn PDF document text
    • https://zitakusosexozi.weebly.com/uploads/1/3/4/5/134595565/pepedofavibores_musapozezu_rabetowodezom.pdfIn PDF document text
    • http://kovafuwir.getenjoyment.net/aquaculture_research_paper.pdfIn PDF document text
    • http://naturebiolog.fun/29113040031lev5j.pdfIn PDF document text
    • http://kolagozisil.mywebcommunity.org/big_easy_turkey_fryer_instructions.pdfIn PDF document text
    • http://drive4mclanemilwaukee.com/molebokomozemq2xd.pdfIn PDF document text
    • http://setofexperience.site/nobutazinaz2tdy.pdfIn PDF document text
    • https://zufulakoloti.weebly.com/uploads/1/3/5/3/135301661/kexoserada.pdfIn PDF document text
    • https://nibasekugi.weebly.com/uploads/1/3/1/0/131070633/9377f30f99011.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ff465d3-39c2-4584-a3b9-d9930c849660/how_to_dim_hunter_fan.pdfIn PDF document text
    • http://dakiwadizadenig.rf.gd/77061760660.pdfIn PDF document text
    • http://wajoran.rf.gd/medium_voltage_switchgear_room_design_guide.pdfIn PDF document text
    • http://sewuxikamumo.rf.gd/cantonese_to_english_dictionary.pdfIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_f82020cebd394d87bd3e46faee055097.pdf?index=trueIn PDF document text
    • https://ca3ec1ac-6ff7-4c8f-ae0f-86a30d86e335.filesusr.com/ugd/3615fb_80a17dc4df674f85a3df4f7bc079bd1a.pdf?index=trueIn PDF document text
    • http://tufelorit.rf.gd/levusoropazilofizafori.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ce8f151-6da6-478d-b507-3dc342605a65/wufefidugebap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dcb4c15-1176-4bcf-aa3e-e8f0a2c23ef3/getting_through_life_together_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adc53ced-1a9a-4dae-a4b1-fdd7b2e609d1/castle_falkenstein_wiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/388a1942-70ba-4ffb-a3c5-97beb8898c9c/year_9_english_vocabulary_list_uk.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.

FilenameKindSourceSize
font_00_sfnt_off000104c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C7 5124 bytes
SHA-256: bf4a876b921fed172f7f385b0b07e42fe8a18f121a0a7724e51f409b04a4ec1a
font_01_sfnt_off00011650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11650 11048 bytes
SHA-256: 2005fd35fe04b18d6fa3edcd449c7b60edfb4827fb6a2033c82644b434f7577a

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