Malicious PDF — malware analysis report

Static analysis result for SHA-256 12191ea5b7d4936d…

MALICIOUS

PDF

72.5 KB Created: 2021-02-18 18:46:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: f32c529e38ba6fb4c8acaf37f9ca5dac SHA-1: 44040b19e651aa165c74408912701d381a1e1cf5 SHA-256: 12191ea5b7d4936d2c4538d8430dadb827275a36815d72da8407d8ac29a4e93c
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The primary malicious URL, https://crophysi.ru/strik?utm_term=an+exorcist+tells+his+story+book, is part of a larger infrastructure designed to host numerous PDFs, likely for SEO poisoning or phishing campaigns. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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/strik?utm_term=an+exorcist+tells+his+story+book In PDF document text
    • https://pizijejubuga.weebly.com/uploads/1/3/4/8/134883891/pujop.pdfIn PDF document text
    • https://xaduvabelo.weebly.com/uploads/1/3/5/3/135324105/12cce7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501991/normal_5fc8ea911a00c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449603/normal_60296cf7551db.pdfIn PDF document text
    • https://mojivuza.weebly.com/uploads/1/3/0/7/130775228/sevosami-nebim-wazupusilis-sidosuduleki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410433/normal_5fdd46cf5171d.pdfIn PDF document text
    • http://bonboxstudio.com/trim_up_the_tree_lyricsr24ay.pdfIn PDF document text
    • http://pribor-poverka.site/phpspreadsheet_convert_csv_to_xlsxlpown.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450630/normal_6009112081b39.pdfIn PDF document text
    • http://dorightschool.com/xalexowezgfw6v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406809/normal_5fe4dc8f58f3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481852/normal_5fd1288844d7e.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/fopalew/fojijunipidefev.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/rezigege.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/outlook_email_signature_template_with_image.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/adobe_photoshop_cs6_full_mega.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_off0000e0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E1 5040 bytes
SHA-256: 2f9619d7809d095cc6ddb24c824e4ebfc87466f8f81b6395a142756046cd6488
font_01_sfnt_off0000f20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20B 10204 bytes
SHA-256: 0c8401910423cabd1cd93e74024ce36488576bd8a5fae04af71a1387405892ec

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