Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73b8614bbf4fd06…

MALICIOUS

PDF

77.6 KB Created: 2021-02-25 12:39:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e7a999d1b5bfd0dd7ceb728328c2efd2 SHA-1: 0a42edf552741de7ecd55b07f84f815517ac7b6a SHA-256: a73b8614bbf4fd06c995ef31738ed7cba22b2e5b130d7513fb6b003074631a6f
184 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 a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. The document body, though heavily obfuscated, contains metadata related to PDF generation, suggesting it's a container for malicious links rather than user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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=enlace+ionico+que+es In PDF document text
    • https://cdn-cms.f-static.net/uploads/4462093/normal_601a3ed903d89.pdfIn PDF document text
    • http://lorakuze.sportsontheweb.net/23487362684.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388181/normal_5fe8fbf3452bc.pdfIn PDF document text
    • http://dujojiwasemob.mywebcommunity.org/my_iphone_says_my_icloud_storage_is_almost_full.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485702/normal_5ff51ddeb8289.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373779/normal_5fec6fb806cfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382781/normal_600a8b63e5298.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499283/normal_601d650749ef8.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
    • http://xowobovu.myartsonline.com/70225206813.pdfIn PDF document text
    • http://xefivaz.epizy.com/hero_wars_guide_warcraft_3.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/free_piano_sheet_music_for_catholic_hymns.pdfIn PDF document text
    • http://kefekebew.rf.gd/ella_minnow_pea_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/blended_full_movie_720p.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_off0000e3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F0 4580 bytes
SHA-256: e1991e6fee57404ea23c5c300c18e208f97adb9b676f054b1a27a6b21813c132
font_01_sfnt_off0000f385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF385 11836 bytes
SHA-256: 6bca9178bcead575e8f17cc4e8203a8dbfe5e367e15d238437f753ca63d33106
font_02_sfnt_off000119d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D5 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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