Malicious PDF — malware analysis report

Static analysis result for SHA-256 237eb40cedf7b844…

MALICIOUS

PDF

113.3 KB Created: 2021-03-20 02:42:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9b5f440039a7c65a9dfa0bfbedbf247c SHA-1: 5c8b211a3e63687cc5995c7541ee6ee0cdd5f9e2 SHA-256: 237eb40cedf7b8445a5cf5d71c6341616eee986d07e4b626f3f197bb4593e88c
126 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, many of which point to disposable domains and are likely used to host malicious content or redirect to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though partially corrupted, suggests a lure related to 'Nova decoding neanderthals worksheet answers', likely a pretext to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/wix?keyword=nova+decoding+neanderthals+worksheet+answers PDF link annotation
    • http://copyrightsupporthelpcenter.com/jirakuz7e2bm.pdfIn PDF document text
    • http://themarkuzmusic.com/45216326515j5cic.pdfIn PDF document text
    • http://mavito.online/books_like_the_bookshop_of_yesterdayssgvfy.pdfIn PDF document text
    • http://belldiscount.ru/64428582254zoyvw.pdfIn PDF document text
    • http://sberbank.link/frases_divertidas_para_el_telefono_descompuestoue58z.pdfIn PDF document text
    • http://proba7.xyz/how_to_cope_with_being_miserableperww.pdfIn PDF document text
    • http://sale50.pro/html_css_jobs_for_freshers_in_bangalore2cq5m.pdfIn PDF document text
    • https://pojajowose.weebly.com/uploads/1/3/0/8/130813819/dawikulep.pdfIn PDF document text
    • http://avto-trokot.xyz/casio_gw_9400_rangeman_price_in_malaysiae2z71.pdfIn PDF document text
    • https://vabeliguteziji.weebly.com/uploads/1/3/1/3/131379360/donaki_jusaliximemuz_vudiwiweboku_pusoderak.pdfIn PDF document text
    • https://jupurelapuloful.weebly.com/uploads/1/3/3/9/133997255/talalatoxezuvuzap.pdfIn PDF document text
    • http://pro-komp-master.website/4525175277ane3k.pdfIn PDF document text
    • http://ighelperscenter.com/xipunetogizopedozoderome59z8f.pdfIn PDF document text
    • http://fruitnaturs.space/why_wont_my_directv_remote_turn_on_my_tvqcg4i.pdfIn PDF document text
    • http://tiktoktop.design/sunenuvemekesakuvavajetumzzy7i.pdfIn PDF document text
    • https://tezifotunojoke.weebly.com/uploads/1/3/0/7/130776805/09e1ca.pdfIn PDF document text
    • https://zukafetovozod.weebly.com/uploads/1/3/1/6/131636890/kifol_fivitetusok_sekufi_dojosasegura.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8dd0205-21e4-4735-a0eb-85571e90d42c/old_navy_covid_protocols.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d874aa5e-5779-4081-88d6-f78d90c69e0d/alita_battle_angel_2019_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a5878ca-63d1-4614-95b1-ab40dd749f3a/whatever_tickles_your_pickle_phrase_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e441443-707b-4daa-b2ce-e4df61b63fc0/66160571165.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92eec616-7ecb-4afd-bed8-48af9a711cb0/verbos_en_ingles_y_espaol_con_pronunciacion.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_off00017816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17816 5384 bytes
SHA-256: 8acac16c940756085d7c239b92959da218800c228ad78111f0061d8440c1a9e0
font_01_sfnt_off00018a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A7B 13888 bytes
SHA-256: fda091664a8600cc01b52381faa14c9609343cb60aec707017f54431812ed9ab

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