Malicious PDF — malware analysis report

Static analysis result for SHA-256 05f8acda6562acdb…

MALICIOUS

PDF

67.9 KB Created: 2021-03-15 15:52:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 75ab0c455f004072c20883f14a350a77 SHA-1: ddbca2a1341f0da692c52adfb49dfb6fcbe0ec62 SHA-256: 05f8acda6562acdb1c47837d991a0d8cac5f65dd3fc914a7c3f84b6258e9a421
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 flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure at 'https://yafferge.ru/wix?keyword=independent+and+dependent+clauses+worksheet+doc'. The document's structure and link farm characteristics suggest it is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution. No scripts were extracted, but the presence of malicious links is sufficient evidence of a phishing or redirection attack.

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 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=independent+and+dependent+clauses+worksheet+doc In PDF document text
    • https://cdn.sqhk.co/posukomokufi/hdMhbgg/wufapixefaxelikaxigil.pdfIn PDF document text
    • https://fogenidu.weebly.com/uploads/1/3/4/3/134391000/vexibarixaj_mosun_segegenase.pdfIn PDF document text
    • https://buvujufa.weebly.com/uploads/1/3/1/3/131379824/e97cf23.pdfIn PDF document text
    • https://cdn.sqhk.co/nanagajog/Znifgih/70964226651.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477155/normal_600d0d7ec2434.pdfIn PDF document text
    • http://pabukelib.66ghz.com/3622050685.pdfIn PDF document text
    • http://kurekarer.22web.org/change_file_to_word_online_free.pdfIn PDF document text
    • https://cdn.sqhk.co/faxiwapa/eifgdzT/megabus_orlando_to_miami.pdfIn PDF document text
    • https://cdn.sqhk.co/konanetufuda/jidghUe/sarujuxetalupoxizep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455403/normal_600f2e89496da.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mexefesu.epizy.com/holy_quran_telugu_free_download.pdfIn PDF document text
    • http://pupuwifemo.rf.gd/rebusuvazela.pdfIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_b293853a7db8482b886f83da82c5d65c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/93c98541-85c6-4237-b781-d3205793b431/buwudidox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53722471-f76a-40d0-a7e0-394ae6c4b49b/zujobeku.pdfIn PDF document text
    • http://forapijedowuvo.rf.gd/because_the_internet_script.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/028a3594-573e-4de5-b985-8494f32179bc/25138374428.pdfIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_51f361513a464fe0a192df50a8ce55c0.pdf?index=trueIn 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_off0000cf34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF34 5256 bytes
SHA-256: c4ef602dae0fd1fb3c9ff2a90f3cc027bfcb7225ccc2bd0cff17357da6e08d4a
font_01_sfnt_off0000e11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11C 9748 bytes
SHA-256: 72b1c2f8ba821ce4a1634654ad54073b2cd0c16cbc855ff2268657eb8d31ef38

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