Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4913b308aa0b14f…

MALICIOUS

PDF

80.7 KB Created: 2021-02-25 05:36:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a94565cfb33164a0234d8dfd9d12cacd SHA-1: dc54e66e5fd284350ffa478ec39f37c327f1ee00 SHA-256: e4913b308aa0b14f7911085cd9b07c0f873c23177fc227cb08be3fdfb7ffff01
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and one specifically linked to a search query about wealth. Heuristics indicate this is a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and URL patterns are strongly indicative of malicious intent, likely involving the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://baarspo.ru/strik?utm_term=how+much+is+the+richest+man+in+america+worth PDF link annotation
    • http://study-english-04.space/divorce_according_to_the_old_testament32aoa.pdfIn PDF document text
    • http://tikovg.xyz/fexevokarusadqdj1n.pdfIn PDF document text
    • http://notdull-eng.online/viditagiwojarilukidusim8163.pdfIn PDF document text
    • https://basavorulifa.weebly.com/uploads/1/3/4/8/134899730/jipidux.pdfIn PDF document text
    • http://uablog.site/7_themes_of_catholic_social_teaching12nas.pdfIn PDF document text
    • http://fuvesozufinefi.medianewsonline.com/fufaxufawevinolejedukapab.pdfIn PDF document text
    • http://a-trvl.ru/hoover_carpet_cleaner_instruction_guidedqa9o.pdfIn PDF document text
    • http://bumawusuka.mypressonline.com/what_micro_sd_card_for_samsung_tablet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408703/normal_5ff9a42a0e2d3.pdfIn PDF document text
    • https://widajuzuno.weebly.com/uploads/1/3/1/6/131637349/8089255.pdfIn PDF document text
    • http://togoxuruk.22web.org/68747329802.pdfIn PDF document text
    • http://lnstagramcentre.net/malwarebytes_anti_malware_premium_lifetime_activation_keyjhe9i.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454966/normal_5fd087ad394a3.pdfIn PDF document text
    • http://tradestaroffice.com/completing_the_square_word_problemspiay6.pdfIn PDF document text
    • http://aduo5.online/kizugezeronatofitemqqy3.pdfIn PDF document text
    • http://fulitip.iblogger.org/rutosonarob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://palalujopaxuv.epizy.com/good_food_guide_awards_2019.pdfIn PDF document text
    • http://zubiluwetij.myartsonline.com/how_to_setup_a_xfinity_remote_to_the_cable_box.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_off0000febd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBD 5060 bytes
SHA-256: 11f374467a3bfe853aec6a718eb69aa0796ad7044d483482c08a1a31105ba65c
font_01_sfnt_off00010fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD4 11080 bytes
SHA-256: 0a97b545a7111770c48133e9f25ee65f4a89b993b249f04ba564c2b3f4a05455

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