Malicious PDF — malware analysis report

Static analysis result for SHA-256 429a00b02ceaab5e…

MALICIOUS

PDF

82.2 KB Created: 2021-03-07 07:44:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 60993f3a1db1130e68f3e81980e7b092 SHA-1: d2c70ed26d49c87cad43965a5382aad777342399 SHA-256: 429a00b02ceaab5e80fee1c868f1864e2f948220c6ee2f93804639d2a868aec2
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for SEO manipulation or distributing malware. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed to redirect users to external content rather than providing legitimate information. No scripts were extracted, but the overall pattern points to a malicious document likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/wix?keyword=composite+airframe+structures+niu+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454822/normal_5fe9f5ce0a08a.pdfIn PDF document text
    • http://natikolom.site/lonely_island_album_download8ss20.pdfIn PDF document text
    • https://cdn.sqhk.co/wunokebewoz/ZN1igje/scor-_pal_reversible_scor-_mat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408996/normal_5fe2f72229a02.pdfIn PDF document text
    • http://trendmobile.ru/queen_of_shadows_tv_show_trailerkol19.pdfIn PDF document text
    • http://bajemafo.iblogger.org/how_do_you_turn_on_a_jam_zero_chill_speaker.pdfIn PDF document text
    • http://blockhcain.host/tiduvagitaxenijigisoneroo2kor.pdfIn PDF document text
    • https://cdn.sqhk.co/debefuki/ifjdigp/preset_lightroom_selebgram_nabilazirus.pdfIn PDF document text
    • http://ebay-coupon.ru/cabbage_farminghhqng.pdfIn PDF document text
    • https://cdn.sqhk.co/bubiwalifeda/Xjcgghb/46791763022.pdfIn PDF document text
    • http://polnews.xyz/87c2ud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gigupagupefexo.epizy.com/47289137222.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8ea9104-249a-43b1-be63-3c6e018e9ba2/73210021532.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c29edc0-1526-4a7b-abe2-8208c49cea1d/falulixakunazunidova.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13ec5997-3dc0-4001-95cb-cff36bb3406c/wutedobuwiridudusofuji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24edbe60-ad93-4aed-8fb6-92a5f7ae91c6/how_do_you_name_a_photo_on_ipad.pdfIn PDF document text
    • http://pokobopuket.epizy.com/67314092060.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28e055f1-b1fb-459e-97e9-1e0fd4010520/how_to_orbit_sprinkler_system.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000f489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF489 6588 bytes
SHA-256: c6acebe3750ab55c09714fa1b34f6c70ddae3ce202e1a088ffcbc34adab53285
font_01_sfnt_off00010503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10503 5172 bytes
SHA-256: 32f2d5f2d97e9a3bb76b0b6ae9941e176467c4e71335dd39feac405396a2bf2c
font_02_sfnt_off0001167c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167C 10756 bytes
SHA-256: 20c6bd936e05696fbb6c810d4a28dc8408dcf1dd991152b7130291a4436759da

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