Malicious PDF — malware analysis report

Static analysis result for SHA-256 593d8588198e23b0…

MALICIOUS

PDF

100.9 KB Created: 2021-05-06 09:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1054a2598b46803a015dfa66222154f7 SHA-1: 93cbd6c3cb15f108e3262e6b9ef74b32ca506444 SHA-256: 593d8588198e23b009a1ef9495de196500363876b7fb6c941a6f3a85cd6237b1
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 0.9995

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://crophysi.ru/strik?utm_term=what+is+the+message+of+the+miracle+worker PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381098/normal_603b705a10b03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495391/normal_6033019ef2dbf.pdfIn PDF document text
    • https://cdn.sqhk.co/tipekafomube/geiaTtd/samurai_paint_2k01p.pdfIn PDF document text
    • https://cdn.sqhk.co/titukopano/shhhaCK/86929264282.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/hiFgIsW/govexanusovogorevoxozaf.pdfIn PDF document text
    • https://dodezugufiz.weebly.com/uploads/1/3/5/3/135331092/7168643.pdfIn PDF document text
    • https://cdn.sqhk.co/korebuxaguz/6iMthbA/art_lesson_plan_ideas_for_elementary.pdfIn PDF document text
    • https://dakurawal.weebly.com/uploads/1/3/5/3/135321076/zovopujelox_fevopufuvatipu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480748/normal_605d512f4efa4.pdfIn PDF document text
    • https://cdn.sqhk.co/tilekixu/IvZjflI/79994641071.pdfIn PDF document text
    • https://cdn.sqhk.co/fexiseme/SgikjhG/music_inclusion_coalition.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393637/normal_5ff9175e027ff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_47d981011839442f81cb41b931998586.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/dinurimiwotegapigexexireb.pdfIn PDF document text
    • https://s3.amazonaws.com/fivebo/flight_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/ruxar.pdfIn PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_acf026e2881a4925b1f845da4284e4b6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wakuzidi/pivozadezujufa.pdfIn PDF document text
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_be914dfde73a4d73b114495d26e58b6b.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA3 5464 bytes
SHA-256: 5f2fc6298e14b10e50d533c56f44e9856ccc1268fdd2219243a304542e5aeb17
font_01_sfnt_off00014025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14025 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off000148b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148B3 10784 bytes
SHA-256: 744ae883fb15a47b8c506c13848fbaa97eb8f809710e739740ddb7d1928c564c
font_03_sfnt_off00016dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DC3 16376 bytes
SHA-256: c3d0ee408bee49a88931d2ac630a9fb52e88a46fabab5a72aa19e78bbe1d3826