Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c330b740de8881d…

MALICIOUS

PDF

99.0 KB Created: 2021-02-22 07:56:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2a93fe3a9ce4543d8d1f9b4a46efeea2 SHA-1: 6a52bedd90b7e29e8554dcddde0476037eca355e SHA-256: 3c330b740de8881dbacd60d0a5ad3e940491b537f8935e2d511114814c8f3d0c
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 0.9997

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://leonvi.ru/123?utm_term=probability+distribution+test+pdf PDF link annotation
    • https://tiposowa.weebly.com/uploads/1/3/1/1/131164246/desuvuvoraraxadodi.pdfIn PDF document text
    • https://xeraxoxatetubus.weebly.com/uploads/1/3/5/9/135993523/882073.pdfIn PDF document text
    • http://xafukuxovikovu.22web.org/pes_anserine_bursitis.pdfIn PDF document text
    • http://vengriya.space/zegotudftyt.pdfIn PDF document text
    • https://wavenugila.weebly.com/uploads/1/3/4/8/134852162/zuxozudumo_vipefejivis_vovevegolabi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386334/normal_602c08463b253.pdfIn PDF document text
    • http://wownatural.fun/wofibuvelijuvu1s2.pdfIn PDF document text
    • https://nemerode.weebly.com/uploads/1/3/0/7/130775229/defej.pdfIn PDF document text
    • http://prizinsta365.website/calma_song_mr_jattjebxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491398/normal_5fe48f92e9aac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457604/normal_6021eca2c7e0f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dutataratoboruj.rf.gd/66259287428.pdfIn PDF document text
    • http://xawezukazekexi.epizy.com/buku_undang-_undang_dasar_1945_amandemen.pdfIn PDF document text
    • http://kagilabitivibe.epizy.com/simegibuxulebixojonebawur.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/superhero_word_search_answers.pdfIn PDF document text
    • http://padubarejibuso.rf.gd/gosuvemuwute.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/71760796948.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/sankhya_paddhati_ke_question_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/mawadazusisonidirapevu.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/weather_and_climate_worksheets_for_6th_grade.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A35 5276 bytes
SHA-256: 9a71c0e3183174e48e5f88b5d5ce6554ece47e3e6bc94de0520e741830edb259
font_01_sfnt_off00013c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C33 13036 bytes
SHA-256: 7bb7bbfcba3a3403f26851a01bd4a3876c8ec06cb2ae80f96562ca21a95c9ea3
font_02_sfnt_off00016875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16875 16196 bytes
SHA-256: 7d13f871ccd4467353f56fa0b0c9c808cb528ea163429cd38fac1b3abaf359dd

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