Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f714ffa9cd7797…

MALICIOUS

PDF

71.4 KB Created: 2021-03-20 03:03:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 81e6ed4d38f2d1f9bda43b6c21d132a9 SHA-1: 84a5514411409c02060f3fd6875dbedb621966f7 SHA-256: a7f714ffa9cd7797b30d8d79fe86ca1c816e069c2bd5c34982cb37f16b743c1a
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains multiple embedded URLs, including one that appears to be a search result lure for 'fsae rules 2020 v2.1'. The PDF also leverages a link farm on disposable hosting, indicating a phishing or scam attempt. No scripts were extracted, but the overall structure and embedded URLs suggest a phishing attack.

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://jacksth.ru/wix?keyword=fsae+rules+2020+v2.1 PDF link annotation
    • https://lelibajoterudu.weebly.com/uploads/1/3/4/0/134042739/kutalofalevolal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426407/normal_5ff1e5ddc062a.pdfIn PDF document text
    • http://dalutufajako.22web.org/audio_visual_materials_in_teaching.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421939/normal_6017b0d52af51.pdfIn PDF document text
    • https://wumotobabupe.weebly.com/uploads/1/3/0/7/130775865/savimisuwonu_womevasi_tekofezebadit_ketabudigobidam.pdfIn PDF document text
    • https://zazalefofano.weebly.com/uploads/1/3/4/5/134578352/kulojonela_rorajewususe_suditu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382187/normal_5fe34e18d9ff3.pdfIn PDF document text
    • https://rexenupe.weebly.com/uploads/1/3/5/2/135299979/merokobugogalesi.pdfIn PDF document text
    • https://tuxedibuzi.weebly.com/uploads/1/3/5/3/135350702/dikobegaxajamum.pdfIn PDF document text
    • https://tujiwukof.weebly.com/uploads/1/3/4/5/134592642/nabiwukokiwekerivo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403262/normal_5ff2644b8b362.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/rujotekitubidazosa.pdfIn PDF document text
    • https://9e705916-5bde-4eb8-be9b-8b3e910fbaf8.filesusr.com/ugd/c7a620_6b62c2c9d98644948e36483e96ca2fb5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/active_directory_full_tutorial.pdfIn PDF document text
    • https://bac325b5-3710-4a60-ba01-c1ac5e8a7650.filesusr.com/ugd/c111de_8e693230381d40f6833e23895d359c6c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/33306829522.pdfIn PDF document text
    • http://rezopokus.epizy.com/hmrc_mileage_claim_form_company_car.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/couples_therapy_communication_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/perfect_english_grammar_past_continuous_exercises.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_off0000dcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDF 5052 bytes
SHA-256: c86b7930a2081928214892c806a3c287144b82c3185445cc78bdad52837fe236
font_01_sfnt_off0000ee25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE25 10184 bytes
SHA-256: 13f3d3a860d4fca744abed52c6d5edb2b54d3ba03b56b6d6d2c3254ec6765242

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