Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e2e41554932bb7…

MALICIOUS

PDF

77.5 KB Created: 2021-02-17 10:44:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f6e829ea926954d0c51fb90a4bd17f8b SHA-1: 088a85f852f5ed01641f12f7a571b20d5d991371 SHA-256: d3e2e41554932bb7ec2d78f0391e9cfff562e8db4e8ee90d43418111d03a9f3f
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV detection further support its malicious nature. The document body, though heavily obfuscated, appears to contain text related to an English grammar course, likely a lure to disguise the malicious intent of redirecting users to harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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/wb?keyword=english%20grammar%20course%20intermediate In PDF document text
    • https://static.s123-cdn-static.com/uploads/4464068/normal_5ffb7428153c5.pdfIn PDF document text
    • http://tortomsk.ru/38743100234wlnr3.pdfIn PDF document text
    • http://dalkomis.website/59843997493ca23v.pdfIn PDF document text
    • http://icub.tech/finaroxolp4sv0.pdfIn PDF document text
    • https://molobaguzali.weebly.com/uploads/1/3/0/7/130739923/c3af9baa.pdfIn PDF document text
    • http://hookup157.site/vexibuwyir73.pdfIn PDF document text
    • http://naykaryadom.fun/898661923lfbqf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461497/normal_60212ab8e58e6.pdfIn PDF document text
    • https://wafiludelo.weebly.com/uploads/1/3/1/4/131437380/6016811.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449768/normal_5fdfa2d55329d.pdfIn PDF document text
    • http://groby-ritual.online/rebel_without_a_crewehj07.pdfIn PDF document text
    • http://draiwenstore.online/7356770918nwfle.pdfIn PDF document text
    • https://komomagifagele.weebly.com/uploads/1/3/4/7/134705279/nirirukaku.pdfIn PDF document text
    • https://fusufuxono.weebly.com/uploads/1/3/1/6/131606103/benoxobiniwuxem.pdfIn PDF document text
    • http://mutedagagagexe.22web.org/bose_headphones_35_ii_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/66659613741.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/latest_trending_meme_templates.pdfIn PDF document text
    • http://sizikipap.epizy.com/android_assets_path_string.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/62342259801.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/bully_game_for_android_apk_data.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE456 5192 bytes
SHA-256: 8dc4503f21291005aa7fc2edddfc7f008dde064a33f8f2270fae619805e7b5af
font_01_sfnt_off0000f5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C4 10904 bytes
SHA-256: 689663d80c379ae48b4b8fe3af5285618ab8c851d7752eb2bc82d7ce8ab90405
font_02_sfnt_off00011a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8A 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

Open this report in the interactive analyzer, or submit your own file for analysis.