Malicious PDF — malware analysis report

Static analysis result for SHA-256 c099860cf5c5ea92…

MALICIOUS

PDF

74.7 KB Created: 2021-03-24 06:28:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 438f0c489d44750168128e664df54a78 SHA-1: 717f9bbe8441f7738839ae74b4188f781de6a6c6 SHA-256: c099860cf5c5ea92737b37a4e54cb38d8270004045ee0e12e6be87e2809684e7
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 0.9996

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=marvel+schebler+carburetor+parts+list PDF link annotation
    • https://cdn.sqhk.co/vumuwilaj/Gjdijhe/sibeluxugexikolepezokopu.pdfIn PDF document text
    • https://cdn.sqhk.co/rukeditele/B5jdj1E/dubai_royal_family_net_worth_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/pulovafafita/fUlJj6a/70311969086.pdfIn PDF document text
    • https://cdn.sqhk.co/sewenajete/hgjKYdc/cognition_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/iajjlgg/vojisig.pdfIn PDF document text
    • https://cdn.sqhk.co/muzipajat/hegfdvN/voziloto.pdfIn PDF document text
    • https://cdn.sqhk.co/venifirub/akjgDwh/11022926366.pdfIn PDF document text
    • https://cdn.sqhk.co/vewukiziwemi/ieR9QFC/47337727129.pdfIn PDF document text
    • https://cdn.sqhk.co/tatogevi/jaOjKWj/kulejaw.pdfIn PDF document text
    • https://cdn.sqhk.co/xubulozirod/hbibmib/33068722037.pdfIn PDF document text
    • https://cdn.sqhk.co/sinupupuzaxa/boSxIF2/backyard_granny_pods_cost.pdfIn PDF document text
    • https://cdn.sqhk.co/rijakobebux/eNlaihQ/wajevotugukotomexoji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/nenepizegijot.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/ministry_of_finance_annual_report_2013-_14.pdfIn PDF document text
    • https://57fc24c6-ba7c-430a-bdae-05304608b610.filesusr.com/ugd/bc9c68_b37c9d3249124ffcbdafa08d260c5e75.pdf?index=trueIn PDF document text
    • https://7835c217-6b95-46a1-915a-76cdebae3fe0.filesusr.com/ugd/debfb4_4ab3f2ac7e1043daab66706862c26aca.pdf?index=trueIn PDF document text
    • https://161abad2-7de2-49bb-9904-d6e2a620a662.filesusr.com/ugd/2eec94_f9222c2a7b3c4706b7f0bc38e27da07d.pdf?index=trueIn PDF document text
    • https://72dfff08-f6cb-4f5d-aaac-ebe71175d6a6.filesusr.com/ugd/c268f7_835e86ad8d304d388f55eb7ad50edbb9.pdf?index=trueIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_e9ca48bbc14944aaae11c6a64bcdd837.pdf?index=trueIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_720c7bedf7b34ceab164a4fccf8ea1d2.pdf?index=trueIn PDF document text
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_b3dd2b6051c34c48b8593ddf75234542.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
    • 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_off0000d2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F2 5224 bytes
SHA-256: c27bba1cf96109d1944780c926e38bfac5187a548b71c701e6671dc2afe8f665
font_01_sfnt_off0000e4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C2 10184 bytes
SHA-256: a1410c5fbc8c5067467be6792a3a876c8d11af686e6aab5adc5060c84088e92a
font_02_sfnt_off000107c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C7 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd