Malicious PDF — malware analysis report

Static analysis result for SHA-256 07190385cd5335b0…

MALICIOUS

PDF

77.7 KB Created: 2021-03-13 16:30:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4f8ae9a1802d61a217caa1fd2cc48cb7 SHA-1: b130306c3062efb2b2f89842277c878ccd07d45c SHA-256: 07190385cd5335b0fc2f59e8e2c8a77f6fd85565352740a96db14caab5574aa2
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains numerous links, many of which point to known malicious redirector infrastructure or disposable hosting, suggesting a link farm designed to distribute malware or conduct phishing. The primary malicious URL identified is https://crophysi.ru/strik?utm_term=toshiba+satellite+l750+ram+upgrade, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to hardware upgrades, likely serving as a lure to entice users to click the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=toshiba+satellite+l750+ram+upgrade In PDF document text
    • https://cdn.sqhk.co/fukafodifi/cighjkF/questions_to_ask_your_chief_operating_officer.pdfIn PDF document text
    • https://dapifakefigev.weebly.com/uploads/1/3/1/6/131636612/cc4e3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460975/normal_6040ed2569c3f.pdfIn PDF document text
    • https://cdn.sqhk.co/lokalofobox/gjbVxi0/41922919458.pdfIn PDF document text
    • https://butopejejix.weebly.com/uploads/1/3/2/8/132814220/5684928.pdfIn PDF document text
    • https://mopomavimixefor.weebly.com/uploads/1/3/1/1/131164117/8653738.pdfIn PDF document text
    • https://radumudoxelis.weebly.com/uploads/1/3/4/2/134235428/vapodojanafapuxafij.pdfIn PDF document text
    • https://cdn.sqhk.co/dodufiruw/ief9hjU/10032299140.pdfIn PDF document text
    • https://tigafuxofezez.weebly.com/uploads/1/3/4/3/134363272/7137873.pdfIn PDF document text
    • https://cdn.sqhk.co/vakolitakap/J5jcjgW/52531334495.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408333/normal_6019add6e2e00.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/ahhijia/84870315817.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1d8c6fc-48c4-4862-9100-168197db8531/nizuzoxefuvijo.pdfIn PDF document text
    • http://bumitorazefi.epizy.com/thimiru_pudichavan_theme_ringtone.pdfIn PDF document text
    • http://juwebud.epizy.com/princeton_review_mcat_practice_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84e1c69d-e31e-4619-9720-57948162beab/hitachi_c12rsh_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58140109-ec62-4971-bee1-72473a33752b/21832478111.pdfIn PDF document text
    • http://bapisebetunijod.rf.gd/algebra_word_problems_grade_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6d210ee-25af-4f23-b482-27ccd2cb38ae/weed_eater_lawn_mower_parts_manual.pdfIn PDF document text
    • http://ruxuwidoke.epizy.com/bhse_onkelz_alle_alben.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a8020f8-1f29-416d-b826-c70091e4e526/officejet_pro_8610_specifications.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e51c009c-8bb3-4d6d-b051-b9eaf93105eb/21104765614.pdfIn PDF document text
    • http://mebexadesojixip.rf.gd/25647109518.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5a1678f-aa02-44a6-8ef7-3a5f538d15b1/kirby_vacuum_repair_locations.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_off0000ec6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6C 5808 bytes
SHA-256: bf9ba81ab1bb8adf9fd9e980d3050080490df0d41a8e60ca195ec12f159e7dd5
font_01_sfnt_off00010003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10003 11916 bytes
SHA-256: d92100c57bfe9f32b96c8e8bf829833c7cd251c67c5fe14c472ceaff80672304

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