Malicious PDF — malware analysis report

Static analysis result for SHA-256 27fa4d6a0319ebfc…

MALICIOUS

PDF

77.0 KB Created: 2021-02-27 13:51:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 76a973eb123a00a71c37007d704e292f SHA-1: d86af68b37e7a41d7e4c250be5185dc8c2d9697c SHA-256: 27fa4d6a0319ebfca42f5942ddd4ac4fbcfa3cebb94b581c07fa3cd04df95967
184 Risk Score
Tags
free-cdn-ebook-manual-lure

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 to known malicious infrastructure. The document body, though heavily obfuscated, contains references to 'lesson 1 characteristics of life answer key' and is associated with numerous embedded URLs, many hosted on disposable domains, indicating a phishing or scam attempt. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to direct users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://yafferge.ru/wix?keyword=lesson+1+characteristics+of+life+answer+key In PDF document text
    • https://cdn.sqhk.co/dubikureta/ezicr3L/dungeoning_idle_dungeon_crawler_wiki.pdfIn PDF document text
    • http://dobikan.22web.org/lesegodozisotofeni.pdfIn PDF document text
    • http://usersonlineguardingsettings.site/91913563000ry1gd.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/LhjrMJr/you_me_at_hello_crossword_clue.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/IigDQsk/wutanutevoburil.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/oster_bread_maker_5838_parts.pdfIn PDF document text
    • http://vurujupafowutox.mypressonline.com/sea_lion_behavioural_adaptations.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380073/normal_600fcf0a64c16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478688/normal_5fd830df93454.pdfIn PDF document text
    • http://koolmaxt.online/information_on_crayfishy4idi.pdfIn PDF document text
    • http://jumbochecker.com/783878853186sxli.pdfIn PDF document text
    • https://cdn.sqhk.co/semiwewedazi/hehbkjd/minecraft_server_connector.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380392/normal_6003aec88d328.pdfIn PDF document text
    • http://peromopativej.mypressonline.com/50_shades_of_grey_2016.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jajunegetilu.rf.gd/biology_dictionary_apk_file.pdfIn PDF document text
    • http://pomogaxelako.rf.gd/81476790625.pdfIn PDF document text
    • http://tapegazopiguw.rf.gd/the_americans_mcdougal_littell.pdfIn PDF document text
    • http://megomofa.rf.gd/xml_reformat_notepad.pdfIn PDF document text
    • http://sukufitax.epizy.com/calcium_deficiency_symptoms_in_plants.pdfIn PDF document text
    • http://girofili.myartsonline.com/gegomibizukunonovazufaz.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_off0000f0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E9 5220 bytes
SHA-256: aa7db4985493ce182c3438ca058ab62a781e85e41fed4b3091bedef43dc395a8
font_01_sfnt_off000102c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C8 10416 bytes
SHA-256: f1a4568f4d97c59b50d6a0c902a11622d464df06334b3589ad3535a007d09744

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