Malicious PDF — malware analysis report

Static analysis result for SHA-256 b63bd20d2feb191e…

MALICIOUS

PDF

77.2 KB Created: 2021-02-19 06:45:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: ecb25ecb976d733b8251b711727d012f SHA-1: e3d31cd0eac8a5665ccc00b44368cf71c316188e SHA-256: b63bd20d2feb191e5f3b8edf5b6927fe1bf4d9c5be0d1496db5774ee75a827d2
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The presence of a large number of external links, many pointing to PDF files, suggests a link farm or a mechanism for distributing further malicious content. The primary URL, https://seumenha.ru/wix?keyword=how+do+organisms+get+the+energy+they+need+to+make+atp, is likely a lure to direct users to a potentially malicious site.

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://seumenha.ru/wix?keyword=how+do+organisms+get+the+energy+they+need+to+make+atp PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4384142/normal_5fec63ae4d057.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464077/normal_5fdd9f55bc0f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454164/normal_5fdbcd667914d.pdfIn PDF document text
    • https://jodegometokak.weebly.com/uploads/1/3/1/6/131606115/1076684.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448976/normal_6005bd4a08c6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447097/normal_6020893ec2297.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450148/normal_5ffb408b12267.pdfIn PDF document text
    • https://rurepatokuzi.weebly.com/uploads/1/3/1/6/131636758/8af1f95999.pdfIn PDF document text
    • https://tujowijide.weebly.com/uploads/1/3/0/9/130969571/35c934eb83.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475852/normal_5ff8d49411dc7.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/remuv/ali_farka_toure_sheet_music.pdfIn PDF document text
    • http://direpedokelazal.rf.gd/avast_antivirus_offline_latest_version.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/xowifiloxerefekurevasovip.pdfIn PDF document text
    • http://jipawivenuzinu.rf.gd/70693391515.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/52130323288.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/38634054137.pdfIn PDF document text
    • http://nivomijerunaz.epizy.com/printable_math_worksheet_for_kindergarten.pdfIn PDF document text
    • http://begosene.epizy.com/gifubofivaso.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_off0000f14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14B 5560 bytes
SHA-256: 67883f6ff8d934b7561b74e2aa3701a72b07b3dabcbc6b6beb9485d20030433b
font_01_sfnt_off0001041e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041E 10392 bytes
SHA-256: 52b1917c1934a48dd9edefdc2f40c59263eef207e986bf44d1056e99cee197c6

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