Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e39f74ee15c47c6…

MALICIOUS

PDF

80.7 KB Created: 2021-03-03 13:57:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bae463f1edd0a5ddc5b489f981c747ab SHA-1: 95b593d0e24df024a36bb153029a3974336589df SHA-256: 3e39f74ee15c47c620958b6ae1783c7ea46e04fa5ebf0a08c363e5b183b8a667
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://zajinet.ru/wix?keyword=planet+earth+video+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471969/normal_6026613639e81.pdfIn PDF document text
    • http://razajegusut.22web.org/halo_3_armor_guide.pdfIn PDF document text
    • http://bukenisefino.mygamesonline.org/kubota_bx_series_for_sale_australia.pdfIn PDF document text
    • http://cardioactiveufficiale.site/mailing_label_template_for_ms_wordmo19e.pdfIn PDF document text
    • http://honbiz.pro/50824082520eqsqb.pdfIn PDF document text
    • http://thesimplycompleteseries.com/how_to_reset_ink_levels_on_hp_envy_45009qjop.pdfIn PDF document text
    • http://medtechnika1.ru/booker_t_green_onions3ejwf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408184/normal_600f2c95a4f89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467564/normal_60013fec0fee3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365576/normal_6001e726cc1e6.pdfIn PDF document text
    • http://liwitesuzemumex.sportsontheweb.net/bipimonusikepef.pdfIn PDF document text
    • http://pumorux.medianewsonline.com/tukusuroderuzatajafom.pdfIn PDF document text
    • http://dutov.org/how_do_you_cite_a_phone_app_in_apa_formaty27zq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zurabogefu.rf.gd/english_to_russian_dictionary_free.pdfIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/fizozatexu.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/97072177570.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/naruto_blazing_apk_ios.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4B 5128 bytes
SHA-256: d93bb55dc54ae9995a83cd6138312034a5a5f1d5d284e9b61746ab0daa614f6e
font_01_sfnt_off0000fbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCB 10700 bytes
SHA-256: d371f811d69fd75b1f8df399513923740152513c6e362b683987ef1cc6d1b475
font_02_sfnt_off0001208a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208A 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848

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