Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a80aad6bc694dd…

MALICIOUS

PDF

73.2 KB Created: 2021-03-04 03:17:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1a37429d5010c2e58ffc4c96adf3d263 SHA-1: 21ec0322b76a248a7de723b91fb507508f3fdfca SHA-256: 71a80aad6bc694ddc01c7c048c093298c92a4da72309d5f2b1ab47475a9e2caa
126 Risk Score

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/wix?keyword=surface+area+of+nets+worksheet+pdf PDF link annotation
    • https://cdn.sqhk.co/putizimetiwe/b5iaUgh/frases_tumblr_2020.pdfIn PDF document text
    • https://wifebazeb.weebly.com/uploads/1/3/1/4/131482826/kujefav.pdfIn PDF document text
    • http://xepidenad.scienceontheweb.net/10060000061.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418185/normal_5ff03c2b53ae6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380863/normal_60184cbaa26ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379837/normal_5fff7cb166b64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421474/normal_5fe74e5c7cdb3.pdfIn PDF document text
    • https://cdn.sqhk.co/bobavijiwoba/3PigIie/62459010138.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/sunbeam_electric_blanket_controller_bl0600.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/inkscape_software_free_download_full_version_for_windows_xp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459784/normal_5fd86a2d82387.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464710/normal_5fe9d32c05b56.pdfIn PDF document text
    • http://tawaguf.scienceontheweb.net/star_wars_bloodline.pdfIn PDF document text
    • https://cdn.sqhk.co/rapigufagi/hJ3hbs2/visewekupikuvapu.pdfIn PDF document text
    • http://lomigakorak.getenjoyment.net/fast_and_easy_crochet_stitch_for_baby_blankets_89.pdfIn PDF document text
    • http://lorakuze.sportsontheweb.net/30792883872.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450251/normal_5fdc79609a80d.pdfIn PDF document text
    • https://cdn.sqhk.co/gavezexu/gdigha1/16167148742.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sulijugofogim.onlinewebshop.net/63210739696.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_off0000e162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE162 5472 bytes
SHA-256: 2815ca07da2a646618514397936ee705768d8b8f35a3c8f8406e43280c94c4fb
font_01_sfnt_off0000f408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF408 10396 bytes
SHA-256: e5c8a6433bf2a3661035277aa49d48a41b55da4e6dade9bdfce3b58a47b6f9e5