Malicious PDF — malware analysis report

Static analysis result for SHA-256 a20da4f94950ff29…

MALICIOUS

PDF

86.1 KB Created: 2021-02-09 13:03:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e826cb48c7b8aa2af36e05832f8d45d9 SHA-1: 50c65019491ce2c15b60e0722ab2f37023aabad9 SHA-256: a20da4f94950ff290c81e41182d5e6ae823678417e2d724f0267d48d8023f072
184 Risk Score

Malware Insights

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

The PDF contains embedded URLs that point to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, suggests a lure related to a biography. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery via the embedded links.

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://crophysi.ru/123?utm_term=amrita+sher-gil+biography In PDF document text
    • https://cdn-cms.f-static.net/uploads/4427498/normal_6016e95033fb1.pdfIn PDF document text
    • http://trells.space/badiliwajipevor89oxh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381766/normal_602185ca18b97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485710/normal_601dcb6ce6f0f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425005/normal_60076d8de5325.pdfIn PDF document text
    • http://mmuuue.space/apple_developer_enterprise_program_license_agreement_has_been_updatedlcrhq.pdfIn PDF document text
    • http://micrometerdigital.xyz/literary_elements_worksheet_1_night_answersee5r0.pdfIn PDF document text
    • https://dabusoze.weebly.com/uploads/1/3/4/5/134585091/ripikefugovix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479460/normal_60062e2003560.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369486/normal_601329d1c5903.pdfIn PDF document text
    • https://tewukowil.weebly.com/uploads/1/3/2/7/132741555/dowek_juvegalelu_zegipakesur_jatovem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412774/normal_5fcd18cff19d7.pdfIn PDF document text
    • http://urro-hu.com/jinoduginofefaradfoie9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://mexowotevofo.rf.gd/w_d_h_full_form.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_off000106b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B0 5496 bytes
SHA-256: 5327f323ffc7a9b58f3410c9cbe2684fffed57f351ab4672fb01577e4400e05a
font_01_sfnt_off00011941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11941 10820 bytes
SHA-256: 59fc99c4d9d4fa9d66e63b186d24cd5a37287a5972edcf5fe4e665bb9dcc6fe1
font_02_sfnt_off00013dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DCD 3484 bytes
SHA-256: f9b643945d3b652fe71bf3f207a5fd65604888305dc4b960a202aa41f05fd2e8

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