Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d7ff4537e27e64…

MALICIOUS

PDF

76.0 KB Created: 2021-02-23 01:08:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2a582ed09560aa74c7e0f7f8b9741a31 SHA-1: bc4e7aa4f51bc48981a69a4f8a71db98964dfe80 SHA-256: a8d7ff4537e27e64c130efa6938b08c855405577b3b7434f77c49c1db774ad30
224 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as an invisible link to a suspicious domain, likely intended to redirect the user to malicious content. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SUSPICIOUS_LINK_LURE strongly indicate a phishing or redirection attempt. The ML classifier also flagged this PDF with high confidence, supporting the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://crophysi.ru/wix?keyword=god+without+religion+andrew+farley+pdf In PDF document text
    • http://reduslim-sito.site/69601959214wpdmx.pdfIn PDF document text
    • http://gemobaraza.iblogger.org/the_entertainer_sheet_music_easy_free.pdfIn PDF document text
    • http://zojulosopejozaz.iblogger.org/xomugapujumarudevuxureva.pdfIn PDF document text
    • http://kivedunorujuw.66ghz.com/cardiac_arrest_usu.pdfIn PDF document text
    • http://moresukko.ru/rixezeqcoqd.pdfIn PDF document text
    • http://lafovawolifi.22web.org/50329127784.pdfIn PDF document text
    • http://tivepijezar.22web.org/instrumentation_technician_training.pdfIn PDF document text
    • http://lnstagram-support.live/gopelijavet26vu.pdfIn PDF document text
    • http://jabisoj.22web.org/mcafee_antivirus_free_2018.pdfIn PDF document text
    • http://joxorapux.22web.org/netacad_exam_9_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dabatisew/galop.pdfIn PDF document text
    • http://pibozaxasoloje.rf.gd/58658899618.pdfIn PDF document text
    • http://lenixad.epizy.com/ximupivuboni.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/7486506025.pdfIn PDF document text
    • http://kiboxanemez.rf.gd/konudidadafev.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/sound_app_for_android_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2C 5232 bytes
SHA-256: a061dbf389093745cba022fdc2b12df3173a7bc4ef1346ae89ad402bd8b6d84d
font_01_sfnt_off0000f113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF113 10428 bytes
SHA-256: 50df34139b8f84dd0b9754efd00ca3bbf6b1b13f460d48ba253b95b03a6b8526
font_02_sfnt_off000114c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C2 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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