Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e87e459749a7747…

MALICIOUS

PDF

105.2 KB Created: 2021-03-11 20:55:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e5af220de29fe3f4a3f133978bce3374 SHA-1: 16e229034f9a7f7a42349a1beeb206cf1feb9caf SHA-256: 9e87e459749a7747df821f13bfee48c74906554e6908fce6dd036b6b93c0372c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://midufefew.ru/strik?utm_term=is+tokyo+ghoul+s3+worth+watching PDF link annotation
    • https://fowerorizer.weebly.com/uploads/1/3/1/8/131856705/7692795.pdfIn PDF document text
    • https://cdn.sqhk.co/devuzemalut/jLygh9A/spiritual_health_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/gapobuzijiru/fjcjiAV/82546735208.pdfIn PDF document text
    • https://cdn.sqhk.co/dijowasedop/idjfgjj/stick_hero_app.pdfIn PDF document text
    • http://nijeratazuw.iblogger.org/integrated_chinese_level_1_4th_edition_workbook_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/rozesivotix/hjiaVbB/youtube_music_cost_nz.pdfIn PDF document text
    • https://norabemomo.weebly.com/uploads/1/3/0/9/130969424/gemufifobedela.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/488fbcd6-d8bf-4bce-84aa-4e4a605b9404/furinno_abbott_corner_computer_desk_with_bookshelf_espresso_black.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13d496e0-ff2b-4468-9f7e-be0e1cc20e47/16055847108.pdfIn PDF document text
    • http://fuvituze.epizy.com/clostridium_difficile_guidelines_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/85119322128.pdfIn PDF document text
    • http://nasakil.rf.gd/biotic_resources.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fbfd78c-20b3-418a-9142-0ce1de78c0f2/bsa_sweet_.22_3-9x40mm_duplex_reticle_rifle_scope_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf89e310-dee5-409f-90d5-97f7587ef94d/guwanog.pdfIn PDF document text
    • http://sidiwen.epizy.com/dulexoxevej.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/amar_chitra_katha_in_hindi.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_off00011da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA0 20880 bytes
SHA-256: e1832f64f16e0b1fac127924a0c261f6e5c42b2c0e4d96e9cf4efc5fc5d89b87
font_01_sfnt_off00015ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FF1 5420 bytes
SHA-256: 5e5192d633c8d6bb8a34b535b97c7d98efeb477b731e43bcdc237b354188de18
font_02_sfnt_off00017276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17276 10756 bytes
SHA-256: fb9ce009c36e7125677bb8a4d37d040423000cc81a886f24b3d0397cb0e6b2cc

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