Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d2b3eb8ec1ab32…

MALICIOUS

PDF

74.4 KB Created: 2021-04-23 16:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fae8ed771e4a651b76df65ea63ed67eb SHA-1: 846e1888061d0b2daa054b1972699d802e4d1f9f SHA-256: 90d2b3eb8ec1ab3271c8287667f494138d3457797afa5fd769c80c39ea3a8960
304 Risk Score

Malware Insights

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

The PDF contains embedded links that lead to a link farm, with one critical heuristic identifying it as a brand-impersonation credential phishing lure for Facebook. The primary malicious URL identified is a redirector designed to lead users to a phishing page. While no scripts were extracted, the PDF structure and embedded URLs strongly indicate a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://mujamixoto.weebly.com/uploads/1/3/0/7/130776872/2544050.pdf.
  • 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/strik?utm_term=how+to+contact+facebook+support+inbox In PDF document text
    • http://kimujitotam.22web.org/los_secretos_de_una_mente_millonaria_frases.pdfIn PDF document text
    • https://cdn.sqhk.co/moserusoba/UjhCheg/fedikixofowitikazobej.pdfIn PDF document text
    • https://cdn.sqhk.co/pevedapev/Cgdhfii/stack_overflow_java_error.pdfIn PDF document text
    • https://mujamixoto.weebly.com/uploads/1/3/0/7/130776872/2544050.pdfIn PDF document text
    • https://jenetekeze.weebly.com/uploads/1/3/4/7/134772573/mojutesekaji_pulifuk_zulijozuwurewi.pdfIn PDF document text
    • https://tixusevonatafix.weebly.com/uploads/1/3/4/6/134611731/wudizo-jalovopupezapa-vemokeguxip.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/gFhgAie/3841671712.pdfIn PDF document text
    • https://zegusuvi.weebly.com/uploads/1/3/4/7/134738546/niliwuwux.pdfIn PDF document text
    • https://momigetufi.weebly.com/uploads/1/3/4/8/134876151/finum.pdfIn PDF document text
    • https://cdn.sqhk.co/tefozakozup/0yheBhi/lenovo_a1000_ringtone_setting.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vofufedufis.rf.gd/mathematics_grade_10_download.pdfIn PDF document text
    • https://229c0a76-8cd2-4a6d-ad64-a548a1436bbb.filesusr.com/ugd/f9ed01_46e13896a8264488ac15fffd14edb872.pdf?index=trueIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_ba5008671f4b4dc4ae3334b706ae6578.pdf?index=trueIn PDF document text
    • http://guxudej.rf.gd/fluval_305_filter_media_setup.pdfIn PDF document text
    • http://rozugok.epizy.com/3262834059.pdfIn PDF document text
    • http://zefabuvo.rf.gd/ibm_blockchain_tutorial.pdfIn PDF document text
    • http://jurubus.epizy.com/clock_template_png.pdfIn PDF document text
    • http://sekekubonigav.rf.gd/doviwu.pdfIn PDF document text
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_7fd787acc235405687a28d2842e6c015.pdf?index=trueIn PDF document text
    • https://7e073981-ad1c-4081-8dc0-76946ba36063.filesusr.com/ugd/c4f63d_9bdf3183892544738fe5641a4d2f05d7.pdf?index=trueIn PDF document text
    • https://849cba27-c1c2-4801-a47f-514a08c45c3c.filesusr.com/ugd/7f7a2c_bc999436d128477ea5a3e2fdec69686e.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_off0000e51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51B 5304 bytes
SHA-256: cd4e14b2a7e6429f4657dc8d2c07c56b0f2a1ee8582da553a27cd6f3f217b62e
font_01_sfnt_off0000f74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74E 10924 bytes
SHA-256: cfec376cd4b0cbc2b2cfc748ca3aa6674dfbb373c476d4ab2acd159ef6974b2b

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