Malicious PDF — malware analysis report

Static analysis result for SHA-256 085a2fffa1eaabe7…

MALICIOUS

PDF

131.3 KB Created: 2020-11-13 20:54:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7527a156880d96c331c4d9b1df46cd2e SHA-1: 7e6214acac39b4b9ac3c0f560c38a134389773e3 SHA-256: 085a2fffa1eaabe705c4b42e5d7d3307c579d3c2e5299bffb54cd2e5aefd46b3
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external URIs points to 'https://traffset.ru/strik?utm_term=posi%25C3%25A7%25C3%25A3o+fowler+ou+semi-fowler', which is likely a phishing or malicious redirection site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • 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.
  • 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://traffset.ru/strik?utm_term=posi%25C3%25A7%25C3%25A3o+fowler+ou+semi-fowler PDF link annotation
    • https://dunojezeb.weebly.com/uploads/1/3/4/5/134586234/xovidudowo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387581/normal_5faeb451d56fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402960/normal_5f999299e9fa4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469106/normal_5fa3d764c473f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411919/normal_5f9b7006c3d7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369190/normal_5f892331e47b2.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f1a8181-7a5b-4e61-902f-310590cc2a38/sunopufedesoxiso.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/22383196878.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81e93905-6c6a-48e6-a2a7-ebaad9bf603b/sudewugobe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de1bcbcb-54c5-41a6-86e4-d8e905c9d48b/pink_floyd_the_wall_1982_blu-ray.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/adjectif_qualificatif_pithte_exercices.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8829af49-8236-40e4-85a0-fe0748380642/32883255958.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11d925cd-82ab-4705-a81b-995e39903515/79727874159.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://www.gnu.org/licenses/gpl.htmlIn 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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00017a47.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17A47 7456 bytes
SHA-256: d14ef372b9f1bec771b4680b20e01b5a948e6344342ce55bbc58633ac8214710
font_00_sfnt_off00014e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E91 7484 bytes
SHA-256: 4390fa5bc78aa4b593d7b209d6c0aa416705ad39f2b90d232526fb564566cf27
font_01_sfnt_off00016836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16836 5328 bytes
SHA-256: b50a73dae6b390885a9683b7abf4cc194f2f956a9f17710354c500b55b97a5b2
font_03_sfnt_off00018ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EA7 23344 bytes
SHA-256: 953d718f32a8b1f7459c9693297fb54fa69783ab4f22fb7f62d8db78ffeb77eb
font_04_sfnt_off0001ce0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE0A 20108 bytes
SHA-256: e979eea70df31c5c08ba37ebce82642602a3321df556eb9bb9c99ba449733ceb
font_05_sfnt_off0001efe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EFE2 3272 bytes
SHA-256: f12a8bd0c28b3261f60f28e78fbe47f54b8c0ce65fc59b370980c14f04d1b058

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