Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb181480101b7590…

MALICIOUS

PDF

85.6 KB Created: 2021-03-09 23:59:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 010ebcf86d53dfac00f45e2882dccd9a SHA-1: 9eae5b32131d8b3762c826557569391d80502bbc SHA-256: fb181480101b75906f4fe8b5c05096ca3b002d11cd20eda7cbaae0fab667f2fb
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 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

  • 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://gimoguvi.ru/wix?keyword=eve+online+escalation+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369166/normal_600be7df7873d.pdfIn PDF document text
    • https://cdn.sqhk.co/tazofexoz/gdjfjjO/zokope.pdfIn PDF document text
    • https://cdn.sqhk.co/dabebasavus/dOnj4Qy/67960379548.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/gh8heeV/62567553658.pdfIn PDF document text
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/zubozabef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472204/normal_6031112cefebf.pdfIn PDF document text
    • https://cdn.sqhk.co/kubabulukod/hdP4IpW/59704499348.pdfIn PDF document text
    • https://cdn.sqhk.co/bipuzojafa/HEjfH6m/muse_dash_download_pc.pdfIn PDF document text
    • https://josazosanika.weebly.com/uploads/1/3/4/3/134339908/3788742.pdfIn PDF document text
    • http://rosativiwam.mypressonline.com/how_to_get_a_lawyer_to_take_your_case_pro_bono.pdfIn PDF document text
    • https://cdn.sqhk.co/zixifazod/gKzCnT9/67698598277.pdfIn PDF document text
    • https://tiluzapibijodok.weebly.com/uploads/1/3/4/2/134265907/ef345c221bc.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/004bda0e-5536-4e73-884c-03ec7255fae4/excellent_equivalent_words.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4da6945a-f3e3-41e4-961c-52706a242a9a/how_to_use_farberware_5_cup_coffee_maker.pdfIn PDF document text
    • http://xomutojekes.myartsonline.com/braun_series_9_92s_electric_shaver_head_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5fe88f1-6026-4020-b61e-c2050a29be74/41670306497.pdfIn PDF document text
    • http://tuwutexo.onlinewebshop.net/92122821130.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/231760fd-829a-4807-bac5-3941a07498d2/dell_active_pen_pn350m_price.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_off0001119b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119B 5028 bytes
SHA-256: f09751ae77bba6843d393cbac14373e7284bcba481e1dd239f7daac678473543
font_01_sfnt_off000122d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D4 10752 bytes
SHA-256: 415051bf9148d994645d81cfe22921048997334f21ea64d182f27ddd8942ac8a

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