Malicious PDF — malware analysis report

Static analysis result for SHA-256 66bf53b6db7a7f92…

MALICIOUS

PDF

80.7 KB Created: 2021-04-01 19:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d47ef8f957ab0804339880ed07d60980 SHA-1: 8005bdbd495ea291d10aff61bc92aa23f51cc7b8 SHA-256: 66bf53b6db7a7f9287cf4b520bc34ec05daac4e48e0bd0fc103553af8fc3798d
186 Risk Score

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://soxebez.ru/wix?keyword=cloud+tv+apk+latest PDF link annotation
    • https://tisuzibe.weebly.com/uploads/1/3/1/3/131379312/wuzer-wapigiruj.pdfIn PDF document text
    • https://cdn.sqhk.co/mujejadalale/RjjGCYe/zoxovataxapapazot.pdfIn PDF document text
    • http://stebsmeh.space/29620004889tw2r4.pdfIn PDF document text
    • http://busivel.xyz/vinajugezezadojegares9ss3k.pdfIn PDF document text
    • http://greatholl.com/kovogelosisaziwakusotid69htn.pdfIn PDF document text
    • http://hookup666.site/background_hd_wallpapers_for_whatsappugcw7.pdfIn PDF document text
    • https://levarimabogi.weebly.com/uploads/1/3/5/3/135328943/givapibug_miwatab.pdfIn PDF document text
    • http://futup.ru/54453072967r7a28.pdfIn PDF document text
    • https://nuwaruwavup.weebly.com/uploads/1/3/4/3/134362645/bemamote-kidemudibiwubu-mozisobibip-jilusudiwoniw.pdfIn PDF document text
    • https://lupilizeranal.weebly.com/uploads/1/3/4/4/134460298/zabizejegelo.pdfIn PDF document text
    • https://cdn.sqhk.co/guxifunuris/oNjejbO/deer_hunter_2018_hack_apk_android_1.pdfIn PDF document text
    • http://sentytld.online/netgear_wn3000rpv3_passwordqruq5.pdfIn PDF document text
    • http://wisecredit.info/1501595601j9e1r.pdfIn PDF document text
    • https://xogukozatakik.weebly.com/uploads/1/3/1/4/131453421/kizawaxugubemabavip.pdfIn PDF document text
    • http://creditstar-kabinet.com/fevavepavezofurejaruguw8lw6h.pdfIn PDF document text
    • http://auth02mobility.com/76193945999lqhaa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_e592cfb6014b4e85a712e176d1f7c909.pdf?index=trueIn PDF document text
    • https://814cba0f-f649-4223-bfe6-7884e6e02b9d.filesusr.com/ugd/c1108c_e26d1e98f2e74fa4bc3e958af633a945.pdf?index=trueIn 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_off0000ff65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF65 4888 bytes
SHA-256: 2d56b22e49b58a09f7bc83ea0dc8e0875caf885d2dc991503bfa43b11dd0a715
font_01_sfnt_off0001101c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101C 11004 bytes
SHA-256: 1a4abde0784642d38b5fead623347e9a25c9efdcce3ad284376a0e5bb126242d

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