Malicious PDF — malware analysis report

Static analysis result for SHA-256 b69911e0a8685f24…

MALICIOUS

PDF

81.0 KB Created: 2021-03-23 03:10:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 897b719e94648df41c3f93021eb41571 SHA-1: 2321df14818bde51d66cf7e33b3dc3b80d2026e2 SHA-256: b69911e0a8685f24dd4efd705bc5472e6bf28cf45286a5483819635e902e60c1
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://nipisod.ru/award?keyword=allen+bradley+contactors+100+series+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368979/normal_604fe891d83ce.pdfIn PDF document text
    • https://fosaxobe.weebly.com/uploads/1/3/4/8/134882536/betedavixe.pdfIn PDF document text
    • https://zedemozotazodi.weebly.com/uploads/1/3/0/7/130776451/bizixa-bujexujeb-rujomituxifekod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450896/normal_5fef943780478.pdfIn PDF document text
    • https://xemibunadagom.weebly.com/uploads/1/3/4/6/134639404/6903203.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427506/normal_601ad7cc03e08.pdfIn PDF document text
    • http://copyrightsupporthelpcenter.com/guvokakc0ojj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476924/normal_6002a6cd6bbb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387061/normal_5fd8fada69dc3.pdfIn PDF document text
    • https://pabarubuvu.weebly.com/uploads/1/3/1/3/131379718/belozuvulewor_wetobelokiw_nuwuzafazovigam.pdfIn PDF document text
    • https://rufuwoja.weebly.com/uploads/1/3/4/7/134735928/sajenekonokujojo.pdfIn PDF document text
    • http://kiwirixup.22web.org/unicorn_editable_birthday_invitations_templates_free.pdfIn PDF document text
    • http://najisemure.medianewsonline.com/vagitakugasafe.pdfIn PDF document text
    • http://bizifemodefi.mygamesonline.org/materi_usbn_biologi_sma.pdfIn PDF document text
    • https://bofopigefofimun.weebly.com/uploads/1/3/4/0/134016695/435396.pdfIn PDF document text
    • http://vashe-zdorovie.xyz/t_mobile_prepaid_plans_25k9523.pdfIn PDF document text
    • https://sigojexubaj.weebly.com/uploads/1/3/2/6/132682800/3545333.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vojusoligobaj.epizy.com/24954827509.pdfIn PDF document text
    • http://nosigegu.onlinewebshop.net/besosisidofibawefo.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_off0000e6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AF 5576 bytes
SHA-256: 595c073842b23d075787fcf06e87fd72f6b8e16c04ed9c11bfedcd4344b80a1b
font_01_sfnt_off0000f9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B7 10996 bytes
SHA-256: a3ce4c32f575ac8c990682ac9c41c0af5cda5511922dc6b237a614daa38f0409
font_02_sfnt_off00011f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F61 16140 bytes
SHA-256: 2732c78df68b4531e26da51a256f0f9ab881cb8a96d1886ade34872d88eeece3

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