Malicious PDF — malware analysis report

Static analysis result for SHA-256 290fa8ff522d37d4…

MALICIOUS

PDF

70.9 KB Created: 2021-03-08 22:29:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 338077f3f6b7571b33ae55652dd1a168 SHA-1: 1bc62b45857b706f080345fd34d30d491121e672 SHA-256: 290fa8ff522d37d46cb8384469064c30b08b678cbc1d4a038949857c979c843d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://xezojetit.ru/award?keyword=puntos+craneometricos+pdf+unam PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4474446/normal_5fee6c3735c68.pdfIn PDF document text
    • http://gagimubu.mywebcommunity.org/who_knows_better_than_me_meaning_in_urdu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381528/normal_60000408844ca.pdfIn PDF document text
    • http://netekepipavosis.sportsontheweb.net/6002329914.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425909/normal_60414fea0630f.pdfIn PDF document text
    • http://nemosixumeki.mypressonline.com/geterodobewisivul.pdfIn PDF document text
    • http://xefawojuj.mygamesonline.org/define_rhetorical_device_literary_term.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476420/normal_6018bc4777878.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428033/normal_5fe7697958ad2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408712/normal_601d67fb6d038.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454424/normal_5ff858e53eb60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391903/normal_6015c50fc6a48.pdfIn PDF document text
    • http://vanimerukaguto.scienceontheweb.net/sonic_nutrition_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370089/normal_60405ec62b33b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458827/normal_5fe2b73477e1e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://medazupu.onlinewebshop.net/garmin_gpsmap_64_64s_64st.pdfIn PDF document text
    • http://rigidafavubo.myartsonline.com/what_gas_mileage_does_a_5.7_hemi_get.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78e85c93-5893-4c22-bb75-c48191535272/is_the_arkansas_permit_test_hard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3816f4f6-f822-4ef7-8c88-b71c3fd9b401/titobisubuv.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88A 5272 bytes
SHA-256: c9cd38dcd0ce833972888cc04f010219b75c95abb59b803deb97e6f8a775e3c2
font_01_sfnt_off0000ea64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA64 10960 bytes
SHA-256: 1e9e2c24f7d5a3dbebd32b2277fde1c59f76708fb383a46058a5bd1095927ab9

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