Malicious PDF — malware analysis report

Static analysis result for SHA-256 95e98ad273681f30…

MALICIOUS

PDF

65.5 KB Created: 2021-02-18 09:01:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 51ff19e59b770c9556ee343a0ea7e463 SHA-1: 70e1129e6dc49a3183d4cb7ca6daec8d9dcfa366 SHA-256: 95e98ad273681f300c4bf2de2ec49aaa7960e617e8922ea09fb4fbd78a7fb85d
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 0.9998

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://crophysi.ru/strik?utm_term=how+to+reset+a+whirlpool+refrigerator+compressor PDF link annotation
    • http://amst-watch-v1.club/isabel_allende_el_zorrohwl5h.pdfIn PDF document text
    • http://mkr-olimp.info/airdroid_android_appgsmaa.pdfIn PDF document text
    • http://sebemigon.66ghz.com/creature_of_fenkenstrain_quick_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426409/normal_6023b7efbb22b.pdfIn PDF document text
    • http://yewes.space/debriefing_the_president_downloadvvbq6.pdfIn PDF document text
    • http://shop-you.xyz/lebanobofubibejabuwo829tg.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/napoledunadigo/invitation_template_for_60th_birthday.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/category_management_procurement.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/bishops_cleeve_secondary_school_ofsted_report.pdfIn PDF document text
    • http://runesufosufej.rf.gd/crafting_guide_mod_1._12.pdfIn PDF document text
    • http://gobonelore.epizy.com/menschen_a2._1_kursbuch_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/agriculture_management_information_system_nepal.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/wulebejebezat.pdfIn PDF document text
    • http://maferodo.epizy.com/46553801273.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_off0000c4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4ED 5480 bytes
SHA-256: 431e0ad56140bcf77460528526f712631da5bb9c6988edfdf9e07e5d7ac7466b
font_01_sfnt_off0000d781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD781 9864 bytes
SHA-256: 0fbe65e64eafce813b5c5357789d88a3a12e1736cb053e8ec4a21385e8a877d0

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