Malicious PDF — malware analysis report

Static analysis result for SHA-256 4011eeda123665ae…

MALICIOUS

PDF

77.6 KB Created: 2021-03-17 12:51:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 27f638512323ddc669633f3d55ff4ca1 SHA-1: 98682f84b587c7cc992fbeaab12aed187dde965b SHA-256: 4011eeda123665aefa89e6d279235a3068f14d7c77a2568ba4de6e55bb98deea
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/wix?keyword=fuuka+yamagishi+png PDF link annotation
    • http://kolaxowivod.22web.org/xokipomuliwaxuzojuses.pdfIn PDF document text
    • http://nuwevabufa.mypressonline.com/konomibu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490929/normal_604502ed9961f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459323/normal_600fec2470d91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481828/normal_5ff00fd84cd14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366304/normal_5ff134c86228b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369796/normal_5fe5bd402d35c.pdfIn PDF document text
    • http://sarawavenudiwap.mygamesonline.org/the_other_side_of_the_door_lyrics.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://borovob.epizy.com/fosiravipekijaxakuri.pdfIn PDF document text
    • http://putazosaw.epizy.com/66943052976.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e8ad9cb-cec9-44fb-a629-0b9507cbf735/what_is_the_average_chapter_length_of_a_book.pdfIn PDF document text
    • http://zutagisite.epizy.com/pvc_train_horn_plans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c45cc53-394f-43f9-91ce-a97b0f13e2af/borderlands_volume_1_origins.pdfIn PDF document text
    • http://jolatuziguxobe.rf.gd/unisa_application_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24622d4a-b06c-415f-a3f2-547e4d119f78/3856444024.pdfIn PDF document text
    • http://ratudafoxivux.rf.gd/10125787148.pdfIn PDF document text
    • http://jesogini.rf.gd/emcee_guide_script_for_christmas_party.pdfIn PDF document text
    • http://xutenasejubibe.atwebpages.com/afspa_file.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/470b3649-6190-4e7c-b3eb-bf90830e5cd0/2003_jeep_liberty_sport_utility_4d_specs.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78E 4800 bytes
SHA-256: a3cd1f4ba521dc6343a07a79a9ee26401e64e6397a6a036a87929c7a3a40cc05
font_01_sfnt_off0000f7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B8 10456 bytes
SHA-256: 9ce5a3d4ce6d0073bb71847d937efda5f2819972a084fbc01d93ce4081324974
font_02_sfnt_off00011b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B68 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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