Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c8295c43d40a7aa…

MALICIOUS

PDF

70.6 KB Created: 2021-02-19 19:54:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: bc71dd7c0144fc7bcf25472ef9de155d SHA-1: 46a0685b76aea50490dd049ce86ea7ade212d207 SHA-256: 2c8295c43d40a7aabdeda2188054d8e2f946adc8e4d01d8a988a8db9ae7bd5cc
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, specifically flagging it as a redirector link and a link farm. The embedded URLs, such as https://crophysi.ru/123?utm_term=what+is+an+indirect+democracy, likely lead to phishing content or further malicious sites. The document's structure suggests an attempt to manipulate search engine results or distribute malicious links disguised as legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/123?utm_term=what+is+an+indirect+democracy In PDF document text
    • https://static.s123-cdn-static.com/uploads/4378406/normal_600265c890686.pdfIn PDF document text
    • https://xupugafowepeg.weebly.com/uploads/1/3/0/8/130814457/0bb2f3d6.pdfIn PDF document text
    • https://cdn.sqhk.co/datujisukebe/cichbDA/super_sonic_skins_for_minecraft.pdfIn PDF document text
    • https://cdn.sqhk.co/kebubupoxiz/BBifb0I/money_cheats_for_virtual_families_2_ipad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420240/normal_600bf3fc1090c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380072/normal_5fded5d02a5a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392873/normal_5ffa1277511ea.pdfIn PDF document text
    • https://xuvamifete.weebly.com/uploads/1/3/0/8/130874567/4648050.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492246/normal_5fd5f0c68ab8c.pdfIn PDF document text
    • https://cdn.sqhk.co/gasubapo/SEgcGii/88208035078.pdfIn PDF document text
    • https://cdn.sqhk.co/kixobaza/bhfjdfT/dire_wolf_hd_wallpapers_4k.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/tobovunoberiki/burial_vault_forms_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/faxavageboriwujovufopipe.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/mobesataxa.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/20930059026.pdfIn PDF document text
    • http://puvusevakap.epizy.com/bezabizixim.pdfIn PDF document text
    • http://bavigozobuk.rf.gd/chemistry_unit_conversion_worksheet_with_answers.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_off0000d8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CA 5264 bytes
SHA-256: e07e4177d7de03fac4cf18ad6bcb7018e0825f751b514413daafb6e0af02c992
font_01_sfnt_off0000ea91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA91 10188 bytes
SHA-256: a3810f368ac6dc15cedadbba9b1e9d689984eac05ab36cbfa9dd35a26d70d4b4

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