Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a31d1f0689e283b…

MALICIOUS

PDF

77.4 KB Created: 2021-02-20 04:15:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 83bb7efc29811620caeead5c7a2ba268 SHA-1: 3f1485f7967b5ae7e50f76a4e6e726c87e0aea8a SHA-256: 2a31d1f0689e283be29255ba607d1409cdc1c612e705bfa1367e9fec36846e94
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to reference a 'Nokia lumia 521 unlock code generator', suggesting a phishing or scam lure. The presence of many external PDF links, some pointing to benign content and others to unknown destinations, indicates a link farm designed to distribute malicious content or traffic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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=nokia+lumia+521+unlock+code+generator In PDF document text
    • https://static.s123-cdn-static.com/uploads/4392667/normal_5fe3eb6b4380c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377679/normal_5fd18be5aab8f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483354/normal_600298cfcdae1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453891/normal_602953d3c5276.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424026/normal_5feaeb512dd5d.pdfIn PDF document text
    • https://kezozebajex.weebly.com/uploads/1/3/4/2/134265808/4032262.pdfIn PDF document text
    • https://jomufoxubibad.weebly.com/uploads/1/3/1/1/131164047/281905d7c5a4143.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450038/normal_601b7508345fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392444/normal_5ff50faf69529.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462059/normal_602e287b52a28.pdfIn PDF document text
    • https://xasukibumit.weebly.com/uploads/1/3/4/7/134749231/9b50703423f005.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/lixasifasi/application_for_employment_format.pdfIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/59715313879.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/jofewitariwedop.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/contractor_subcontractor_agreement_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/30888324330.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/va_alive_and_well_statement_form.pdfIn PDF document text
    • http://rabibunipidozok.epizy.com/ranajego.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_off0000ddd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD4 5304 bytes
SHA-256: 8f807a239115866dc561cda8cd064633edb3d600ae21e08def6362590597397d
font_01_sfnt_off0000efce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCE 12320 bytes
SHA-256: f649115afa35f6f4a7df06fe86df07293a0a3d83aad202e955127a0cf14d1d6c
font_02_sfnt_off00011829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11829 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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