Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dfab73a91a4f5c4…

MALICIOUS

PDF

78.7 KB Created: 2021-03-31 15:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 02c6ce59eba7d4a177baa87c8ff3d7b1 SHA-1: b0928b760f52eca05f2c85a371f347c7b871e478 SHA-256: 6dfab73a91a4f5c45e2e44d07ed1bda5db6262a8f2271b05d51847096ec6ef94
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://seumenha.ru/wix?keyword=hp+vacuflo+model+26+manual PDF link annotation
    • http://rolapisi.scienceontheweb.net/types_of_validity_in_research_with_examples.pdfIn PDF document text
    • http://rovanenafet.getenjoyment.net/santa_baby_piano_sheet_music.pdfIn PDF document text
    • http://zemegazi.22web.org/53067652318.pdfIn PDF document text
    • http://jujavekerubeko.scienceontheweb.net/23286992640.pdfIn PDF document text
    • http://defumemijiwof.22web.org/teaching_interview_questions_and_answers_victoria.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/jevelel/wupifugoxesalo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba8a88b3-886d-4d08-a4c6-5909e5d914f3/12537804695.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a962d64e-8794-4a7b-aa84-7ff4cb7475ca/writing_effective_sentences_quiz.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/resukanifilusagowaletow.pdfIn PDF document text
    • http://zikituxepori.epizy.com/asvab_practice_test_download.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/maxebasububebikizokiza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50e5b042-2780-4758-a16f-a585619e2c20/24440009612.pdfIn PDF document text
    • http://nividibewejoba.rf.gd/angry_birds_go_2016_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf2fde0f-d23c-4ae0-a10e-9a1c53b01028/the_republic_of_texas_is_no_more._what_event_caused_this_quote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a87d543e-0c94-445d-a95b-8291adec9926/15017718269.pdfIn PDF document text
    • http://leparitupoxow.onlinewebshop.net/62178004704.pdfIn PDF document text
    • http://bimomog.rf.gd/55907601324.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a3ebfbd-1e2d-4d91-9cb5-20320ac884b7/sprint_promo_codes_november_2019.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_off0000f11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11D 5336 bytes
SHA-256: b56d3affcf5ade3c0bde6d6a998f96ffb789f7f79046a9de2c27172ccf0ce760
font_01_sfnt_off00010344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10344 12720 bytes
SHA-256: d6e344b474ab64845c41a07a85e7670fd1642093795b770f1950521e7a1c919d

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