Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb7aec918bb3ad2…

MALICIOUS

PDF

70.0 KB Created: 2021-02-19 23:11:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 17548d91265f21cf7e646badd6c956f1 SHA-1: 923a6daff9653a31de684948f8d5552f94c64536 SHA-256: fbb7aec918bb3ad2bb6ee15011679677d5053c41464b937a98692c7cbb5df5f5
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://jottigo.ru/123?utm_term=excelsior+college+accredited+in+texas PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479237/normal_5fd12856149d7.pdfIn PDF document text
    • https://cdn.sqhk.co/miranilu/ahfgijK/pacman_classic_arcade_game_online.pdfIn PDF document text
    • https://vadutebo.weebly.com/uploads/1/3/4/8/134889136/teniwawalo.pdfIn PDF document text
    • https://tutuludoj.weebly.com/uploads/1/3/0/8/130874598/a1a5ad6e6b1.pdfIn PDF document text
    • https://pitefomut.weebly.com/uploads/1/3/2/6/132682610/2935541.pdfIn PDF document text
    • https://nipobajomofak.weebly.com/uploads/1/3/4/6/134641158/7491d.pdfIn PDF document text
    • https://cdn.sqhk.co/fugolamudara/LUiaZqt/classic_chess_piece_designs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378620/normal_602ecc3f8bd29.pdfIn PDF document text
    • http://operationhomeplate.com/27877890048lemga.pdfIn PDF document text
    • http://salonvarna.com/55289956496bx57i.pdfIn PDF document text
    • http://wirelosine.22web.org/18141793558.pdfIn PDF document text
    • http://bnatural.space/adding_fractions_worksheets_with_answers5s9zz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368250/normal_5fd63b1b75b98.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
    • http://warixogaje.epizy.com/30575783913.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/afinador_de_guitarra_app_para_android.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/67791511635.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/65993618137.pdfIn PDF document text
    • http://bidavotajowev.epizy.com/22786371572.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/91817965917.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_off0000c9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B0 4920 bytes
SHA-256: 1f2e0e9e8a04218921639161fe25fa74ff1c615db9a0455b885c087bde2f9d24
font_01_sfnt_off0000da6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6D 9968 bytes
SHA-256: 2a11c25669bef69ca629b234e8baeba69c3e82b3f960bdd807e8b8126d2a76a5
font_02_sfnt_off0000fc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9E 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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