Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee707b4c069044b3…

MALICIOUS

PDF

72.8 KB Created: 2021-03-15 16:08:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d12f1112336bfac2cf0e1f62ff02185 SHA-1: b504c2a82b646d55c9b57bdeb3899ccbd831f547 SHA-256: ee707b4c069044b3b65053e8c8e679138ac34eef90edbe71a394e5fb141ca53d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting it functions as a link farm or phishing lure. The presence of PDF_URI and PDF_SEO_LINK_FARM heuristics indicates an attempt to direct users to potentially harmful external sites, such as 'zajinet.ru' and 'shtampshop.ru'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/strik?utm_term=dell+active+pen+change+battery
    • http://shtampshop.ru/vudepaqmadb.pdf
    • https://ridimejaxokixis.weebly.com/uploads/1/3/5/3/135340331/xupokesafumaxoxa.pdf
    • https://cdn-cms.f-static.net/uploads/4492555/normal_5fdac52d88fae.pdf
    • http://iranomics.com/54872326897sblp6.pdf
    • http://fullpisetc.ru/archaeology_books_in_sinhala165qo.pdf
    • http://trysol.xyz/dogagaretimof38g7n.pdf
    • http://shishkin-seed.xyz/spider_man_ps4_suits_guidehz6f1.pdf
    • https://static.s123-cdn-static.com/uploads/4417429/normal_5ff1bc4544623.pdf
    • http://trylait.pro/64829196453rdwat.pdf
    • https://static.s123-cdn-static.com/uploads/4377905/normal_5fcc87bbd1a89.pdf
    • https://mibubibot.weebly.com/uploads/1/3/1/8/131871690/8239886.pdf
    • http://obschee.xyz/19541131224acsje.pdf
    • https://cdn-cms.f-static.net/uploads/4377115/normal_5fd6fd12c0f02.pdf
    • https://nagajaburelu.weebly.com/uploads/1/3/2/7/132740350/2430419.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d14b19ef-fd1f-4de2-ac86-4436df934e0b/nanawetadajopodidu.pdf
    • https://uploads.strikinglycdn.com/files/7ef488ad-6fb7-4676-9d24-fe8bac25f804/91251675693.pdf
    • https://uploads.strikinglycdn.com/files/85d916d1-0ca5-4c9d-bc04-ae3e14b7985c/wheel_horse_520h_seat.pdf
    • https://uploads.strikinglycdn.com/files/ab2b7406-18da-4f9e-be0a-234854f18dc4/how_to_hack_inquisitormaster.pdf
    • https://uploads.strikinglycdn.com/files/7336de79-0b42-452f-a5bc-b91bb55aa169/zagavadobafobosaxelomalas.pdf
    • https://uploads.strikinglycdn.com/files/7653854d-3ac9-428a-a216-57a7c1734ce4/how_to_write_no_solution_in_set_notation.pdf
    • https://uploads.strikinglycdn.com/files/9a0e0703-bcb7-45b1-a4a6-2b10b9202f64/what_is_the_goal_of_healthcare.pdf
    • https://uploads.strikinglycdn.com/files/88bfd8bb-4c18-4224-97d2-ad41fb76a5d8/neil_degrasse_tyson_universe_netflix.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ded6.bin
1bea74bca74b613dfa07266849293e48017dd1a40816a0d984f2dc0192e046c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDED6 5320 bytes
font_01_sfnt_off0000f0fa.bin
67936f46a1e237c99a1779345c06824bd968184eaabb317494d3e6a8381ae8d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FA 10388 bytes

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