Malicious PDF — malware analysis report

Static analysis result for SHA-256 a24f207e540f7f03…

MALICIOUS

PDF

82.9 KB Created: 2021-03-09 21:45:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a25c79d48abb79861ae490086985a2a1 SHA-1: 6260af7a978fb3dcff5750786b8bdfdcfe09dfdd SHA-256: a24f207e540f7f0325f8730ca3f42229672698b7b3429cd21fe1127bce803d13
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://kuzutuzo.ru/wix?keyword=camp+lemonnier+djibouti+survival+guide PDF link annotation
    • https://cdn.sqhk.co/jarogofef/bico5ig/luzopaxudokin.pdfIn PDF document text
    • http://nubigawe.22web.org/rirevesepowuje.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolefowi/fRhjjid/dice_tech_jobs_app.pdfIn PDF document text
    • http://metarapuw.mypressonline.com/accountancy_class_12_short_notes.pdfIn PDF document text
    • https://cdn.sqhk.co/toralapiluw/hHicOja/48640208772.pdfIn PDF document text
    • http://jaralet.getenjoyment.net/free_math_word_search_puzzles_printable.pdfIn PDF document text
    • https://cdn.sqhk.co/vawapisoxe/fjhih6E/80_s_freestyle_music_artists.pdfIn PDF document text
    • http://lagulesuko.medianewsonline.com/29372636412.pdfIn PDF document text
    • https://cdn.sqhk.co/lezubenewago/hfYWcjg/come_scaricare_stickers_su_telegram.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lojetejimekatow.rf.gd/73794881981.pdfIn PDF document text
    • http://vunonam.atwebpages.com/wetiz.pdfIn PDF document text
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_e78087c156234e6cac09154dc6491785.pdf?index=trueIn PDF document text
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_2e764f410f1b4da1b94cb70b7a8ceb51.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/524aef60-fd66-40f1-a966-366168a9188d/34044316144.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e81044f4-340e-46d1-9817-ecea3e62a476/nijox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cf5d246-e3e1-49c3-9f17-86c013293384/finekotigalevom.pdfIn PDF document text
    • http://kesanovufosu.rf.gd/rerapakabum.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001084c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084C 5460 bytes
SHA-256: a797d5dba334ea0004b2343894f6b860171b6f228cd70a4e29a11188a12ff64f
font_01_sfnt_off00011ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC6 10556 bytes
SHA-256: ce9c17d5f0330702359395cd830054aaa54e7b42ae3d650c972839b617f5d3d1

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