Malicious PDF — malware analysis report

Static analysis result for SHA-256 e52b7c73c2c36a7b…

MALICIOUS

PDF

69.6 KB Created: 2021-03-04 16:45:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1f5d2e42bb3015dcdeef11317e6908ce SHA-1: 1cc217a2147e8b11271219f44f7bfb01374d5216 SHA-256: e52b7c73c2c36a7be91a3092aca1f10e0f93e57329ff9835ae77fa38241e2fc8
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-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://golowaki.ru/wix?keyword=buffalo+ridge+elementary+gillette+wy PDF link annotation
    • http://vizazovabula.mywebcommunity.org/vosoxopeturikona.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454694/normal_60036f4b8c700.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474739/normal_5ffa5b7121123.pdfIn PDF document text
    • https://mivagadak.weebly.com/uploads/1/3/4/5/134599435/dc992b1f26.pdfIn PDF document text
    • http://sawedes.mywebcommunity.org/is_rpg_maker_vx_ace_free.pdfIn PDF document text
    • http://latitekiwa.scienceontheweb.net/roku_2_xd_specs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390642/normal_60312d7a5a09b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374013/normal_5fdd76a526666.pdfIn PDF document text
    • http://vopagokiniki.mypressonline.com/optiplex_755_sound_drivers_windows_7.pdfIn PDF document text
    • https://lanekugufer.weebly.com/uploads/1/3/5/3/135351315/sivaw.pdfIn PDF document text
    • https://bupulaserora.weebly.com/uploads/1/3/1/4/131437689/semifamamibabuj-gireg-todalafipijevi-vupokorob.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/dazawojob/neniwodewatawawo.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/jiviwafajujalutiwot.pdfIn PDF document text
    • http://vipaviveza.epizy.com/ascaso_dream_manual.pdfIn PDF document text
    • http://nuwadolonopip.onlinewebshop.net/psalm_51_wisdom_in_the_secret_heart.pdfIn PDF document text
    • http://punolubumima.epizy.com/college_application_resume_template.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/xidorag.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_off0000c7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A7 3384 bytes
SHA-256: d93910cb8ca1fd3af04ead3f0408adc972b8c825413ebbe286a14f0dd75621e2
font_01_sfnt_off0000d3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C8 5292 bytes
SHA-256: 47a72cd436354886b5d97477eeb8f0572f99eecce5491f6f098e6fa647e206dd
font_02_sfnt_off0000e5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CD 10256 bytes
SHA-256: 5c40a740c760e67bbfe69a7a704f79f92a20e0190758ab4f2218def77aa73f8a

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