Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec980d2b53ac207d…

MALICIOUS

PDF

77.1 KB Created: 2021-03-05 08:29:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: de6b76544d8de1c16112b332fee05d85 SHA-1: 86d60c43d89906fbd3fbffa332def8dcae7ede2d SHA-256: ec980d2b53ac207d62e5de1752674136548edad890733221481c053cda43d5eb
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://pelibifir.ru/123?utm_term=minolta+xe+review PDF link annotation
    • http://stankoff.org/ms_excel_2016_tutorial_free_download83eb0.pdfIn PDF document text
    • https://cdn.sqhk.co/juzurupivepo/Jy4hhgd/okay_alright_meaning.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459164/normal_5fee18e86e241.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493876/normal_5fec41e5e90b9.pdfIn PDF document text
    • https://doselarifiniwa.weebly.com/uploads/1/3/2/8/132814949/zafubozobesepofitosa.pdfIn PDF document text
    • https://dibarovufi.weebly.com/uploads/1/3/0/7/130776786/vuwuxa_suxebutawilo_sukeguke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470526/normal_5fdbc12ed990c.pdfIn PDF document text
    • https://lojodisomu.weebly.com/uploads/1/3/4/0/134042672/fesixafuvofaxukuju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489411/normal_5fec35dbc3a65.pdfIn PDF document text
    • https://cdn.sqhk.co/lididiregi/LtTgfif/lego_pick_a_brick_wall_uk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454682/normal_6007b4160a2bf.pdfIn PDF document text
    • http://moreprodukti.com/15792521116is20h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387807/normal_5ffa16f5de00e.pdfIn PDF document text
    • https://cdn.sqhk.co/sevijeruba/cgchejg/97372163076.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478137/normal_602e5d4424d9c.pdfIn PDF document text
    • https://cdn.sqhk.co/popaxutu/cdPiGSw/dakakewofavumagitipurosap.pdfIn PDF document text
    • https://fosevikotik.weebly.com/uploads/1/3/1/6/131637163/posuvova_dedixorawenagom.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/175590d0-ad2a-41a0-a0cb-5639e75f9153/unterschied_zwischen_singer_heavy_duty_4423_und_4432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d930e0db-230f-4d88-9669-d9f37970568c/zowarubifurusapuzeva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64ba7656-c91c-4a18-ab93-698a0c254048/pimapido.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a3bc80f-38d3-4bbe-a8b7-1c4763380e6a/can_you_get_dbt_on_the_nhs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2fac8f9-8a58-4913-a7f2-d29f0d512038/beats_studio_3_wireless_red_light.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_off0000f203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF203 4728 bytes
SHA-256: 063bac653bdc8f580f732438957ef76a78dcf2c47de21ca4efd44590081395d3
font_01_sfnt_off00010245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10245 10812 bytes
SHA-256: 961bb75041212b5ec30a2cb092e2927d3d0dcd09b73fd6c8d41815e4a8e7c346