Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f5d4c0ed7568542…

MALICIOUS

PDF

83.2 KB Created: 2020-12-23 17:30:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 91d41384602e4fb6b1ddc97646af8d97 SHA-1: 76af6a24edcf88bf7165948913ebdfe64dd8b554 SHA-256: 1f5d4c0ed7568542aa59b6677144d270c90bb98aea8674ddba41a4965e5ad076
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external links points to 'https://traffnew.ru/strik?utm_term=outliers+meaning+math', suggesting a phishing or malicious content delivery attempt. The ClamAV detection and ML classifier further confirm its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffnew.ru/strik?utm_term=outliers+meaning+math PDF link annotation
    • https://xavapijiwo.weebly.com/uploads/1/3/3/9/133997403/fenibuv-febedixezufusa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412757/normal_5f9c6cf197515.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369793/normal_5f97c27a47d10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420906/normal_5fd07fc6853d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369185/normal_5fafd039b0e99.pdfIn PDF document text
    • https://xovewelokajefi.weebly.com/uploads/1/3/4/8/134864882/zakasiligis_xudep_wazipolujopag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418369/normal_5f9f8b25c9dd6.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/desenaz/what_is_a_four_term_contingency.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/catecismo_catolico_para_la_primera_comunion.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/jci_accreditation_standards_for_hospitals.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/17005449310.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/22559535370.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/layers_of_the_atmosphere_earth_science_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/kituridakedizasij.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/the_witch_online_full_movie_2015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f0083dc-a217-496c-b40e-c4ef83f4fa70/reproductive_system_worksheet.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
    • 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_off0000ef73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF73 5124 bytes
SHA-256: 71a1a6e0c9c1cd0649d0784f792e72b9787480d50f3a2b6d74429d939238a801
font_01_sfnt_off000100a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A9 12200 bytes
SHA-256: d2b2a85d0ccc70349a90889ce1b39161bb7a259a5f1689739e5b1c7ed05adaf2
font_02_sfnt_off00012a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A72 16196 bytes
SHA-256: be9ad83977c8c6662ba6700a3f521ef0814cf838925a40eeb43f50878835b4fe

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