Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b921eefdb0b211e…

MALICIOUS

PDF

69.0 KB Created: 2021-02-10 18:19:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e6da65a3820fde1350fa61f8a2c300ce SHA-1: 66b5ad5162aecc4993295b9d880444d8382f5da7 SHA-256: 8b921eefdb0b211e259b138d2642d5d0c62d913499e087dfe6e93039facbe46b
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to redirector infrastructure, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious redirection, potentially leveraging JavaScript for obfuscation or execution.

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/aws?utm_term=google+sites+academic+template In PDF document text
    • https://cdn.sqhk.co/pozedezupase/Pvhjgd1/22837263433.pdfIn PDF document text
    • https://cdn.sqhk.co/vafebutiman/bijjf2F/switchblades_for_sale_in_arizona.pdfIn PDF document text
    • https://pifujikis.weebly.com/uploads/1/3/4/8/134875168/pelazuxezofofiw_penuwevun.pdfIn PDF document text
    • https://cdn.sqhk.co/nusideja/3OC0icA/shell_club_fidelite_les_cadeaux.pdfIn PDF document text
    • https://cdn.sqhk.co/sikibeve/shgqBlc/michelin_police_pursuit_tires.pdfIn PDF document text
    • https://cdn.sqhk.co/maxanogefo/2pNnhgA/85925225008.pdfIn PDF document text
    • https://cdn.sqhk.co/tumupowe/gqa6mii/are_hobby_lobby_stores_open_in_mn.pdfIn PDF document text
    • https://cdn.sqhk.co/xizemeginu/gilZghh/41050358218.pdfIn PDF document text
    • https://cdn.sqhk.co/wanaxowuwot/cThaBfJ/26338289894.pdfIn PDF document text
    • https://cdn.sqhk.co/munakuvu/ojcjaHi/madederovipisixutijusozir.pdfIn PDF document text
    • https://nonedavoxezi.weebly.com/uploads/1/3/5/9/135956696/83493a7cdd3a364.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/fulazelof/bollywood_movies_free_latest_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/fannin_county_texas_arrest_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/d._c._college_hajipur_2018_results.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_off0000d201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD201 5328 bytes
SHA-256: 952bb7c578c2e90bd541725eff312da3113bc8f89ebb5261f5b8d63eb358c691
font_01_sfnt_off0000e41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41C 10396 bytes
SHA-256: a6e53be54ce250ac4abee3f1d2e87366204645438ecf0764a7fe521ee8a46318

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