Malicious PDF — malware analysis report

Static analysis result for SHA-256 b87987b35c93ba6c…

MALICIOUS

PDF

77.6 KB Created: 2021-03-24 01:21:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 71477c3c3fdf1442a966c62be270de18 SHA-1: d6594cd83e2c13f642608857d413829120ea1f2c SHA-256: b87987b35c93ba6cac1b0c4742198d576458ced51aa81dae1c4f9852bae91077
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many hosted on disposable domains, strongly suggests a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://fokemale.ru/aws?utm_term=what+do+you+need+to+major+in+to+become+a+marketing+manager PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388420/normal_6040495849800.pdfIn PDF document text
    • https://cdn.sqhk.co/wevafixap/ek4nHhh/warhammer_2_total_war_malekith_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/bexefoboxevi/hjdhjbC/unisa_official_transcript_form.pdfIn PDF document text
    • https://puxivulikuvudet.weebly.com/uploads/1/3/4/6/134663564/lajuluzesodi.pdfIn PDF document text
    • http://ziposodepow.mywebcommunity.org/79229569131.pdfIn PDF document text
    • http://jakusavu.sportsontheweb.net/instantaneous_velocity_in_calculus.pdfIn PDF document text
    • https://zanonolupurezo.weebly.com/uploads/1/3/3/9/133997165/xiralezemugifezi.pdfIn PDF document text
    • https://cdn.sqhk.co/ronuwimo/jbp8ibr/pulse_point_meaning_in_biology.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455196/normal_602094b72c73d.pdfIn PDF document text
    • https://gokokunebede.weebly.com/uploads/1/3/0/8/130874183/zoxitefunez_ronini_govofiduj.pdfIn PDF document text
    • http://kunutudusoxa.mywebcommunity.org/happy_birthday_easy_piano_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/rJBigge/livaxuwavuzijobokiketa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413456/normal_6015272658ecf.pdfIn PDF document text
    • http://dexiwakuxabef.medianewsonline.com/phonics_reader_for_preschoolers.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/2fjdugc/candomble_religion.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491687/normal_5fca2e142a34f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zotubune.myartsonline.com/proform_505_cst_treadmill_costco.pdfIn PDF document text
    • http://vikuwopijoxu.rf.gd/olympus_om-d_em-1_manual.pdfIn PDF document text
    • http://mozutulobiris.onlinewebshop.net/jolafapinuwinojeduvututej.pdfIn PDF document text
    • http://gufopexolax.myartsonline.com/rolowevujivepik.pdfIn PDF document text
    • http://junanigemos.epizy.com/bolobibesifilebudadejopa.pdfIn PDF document text
    • http://sutexuvidag.myartsonline.com/masatafejazazijuxumo.pdfIn PDF document text
    • http://dujepuxa.rf.gd/83763907508.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_off0000f2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B0 5536 bytes
SHA-256: af4d42978b9a5fbd6dc69e93ec28b34adb896e8b16f039bff22f1074854fc755
font_01_sfnt_off00010574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10574 10152 bytes
SHA-256: 5e346d3c2ccee2f2bcf12c14d011edeb9a2106dcc9d032eb986490442f80be30

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