Malicious PDF — malware analysis report

Static analysis result for SHA-256 05c4b63c31575462…

MALICIOUS

PDF

77.3 KB Created: 2021-03-04 03:54:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 76c7c8050394c1ae93f33d577e33798a SHA-1: 82f1782e29e4169bc7c869b90f237b70ad9ae37e SHA-256: 05c4b63c315754628807f6f03ee00b016b2cd55cc09a7bd14e9e8b3601e9ea61
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by 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 4

  • 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/123?utm_term=how+do+you+set+your+spectrum+remote+to+your+tv PDF link annotation
    • http://parrrtner.xyz/ejercicios_resueltos_propiedades_logaritmos_4_eso1xz8k.pdfIn PDF document text
    • http://genusadnlo.space/77629878586s0fea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376088/normal_602dfe670f10a.pdfIn PDF document text
    • http://gamowenugeg.sportsontheweb.net/librecad_freecad_qcad.pdfIn PDF document text
    • http://trenketo.buzz/first_aid_usmle_step_1_2021_changescwbgr.pdfIn PDF document text
    • http://bcpreactiva-enlinea.com/22061656643wsdcf.pdfIn PDF document text
    • http://hesap-al-sat.com/tintin_dog_snowy6ncx4.pdfIn PDF document text
    • http://klokisik.space/70825344884ua1za.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379606/normal_6040153322be9.pdfIn PDF document text
    • https://gakewejodum.weebly.com/uploads/1/3/4/9/134902465/xefokaxokupepe_niborepop_patebonelejitut.pdfIn PDF document text
    • http://apparentlyopt.com/wesabajawamudezo348vy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414695/normal_601ebd76f11f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414339/normal_60333f8e0ef81.pdfIn PDF document text
    • http://zokugorevat.mywebcommunity.org/what_is_the_shortcut_for_emojis.pdfIn PDF document text
    • https://cdn.sqhk.co/jiluputumusi/hcaMBhh/gun_strike_ops_ww2_mod_apk_unlimited_money.pdfIn PDF document text
    • https://ludebopukum.weebly.com/uploads/1/3/1/3/131380916/jitiwesobapuvowajote.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/Eg9jbCR/6824103459.pdfIn PDF document text
    • http://wugupomovupa.sportsontheweb.net/nikon_d5600_dslr_camera_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/vipikunowi/x5jhd5t/entergy_new_orleans_la_zip_code.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://diwavubodinaroj.myartsonline.com/jigozategiwegafukaboguso.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_off0000e56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56C 4920 bytes
SHA-256: 589cd5d4ade9ae56bb9f1f60dee3f2f5bfc0200a05573fcf3dd3f19b75f6cb1d
font_01_sfnt_off0000f645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF645 10368 bytes
SHA-256: 5c87ce3b6ebd7b0072e3ca702210aab16fa297c675893b8e37a9998ba2d628af
font_02_sfnt_off00011994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11994 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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