Malicious PDF — malware analysis report

Static analysis result for SHA-256 27348de2a0302c7e…

MALICIOUS

PDF

95.4 KB Created: 2021-03-19 17:32:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 00ad07a4c271f7786007234f10ef7e24 SHA-1: 4729346fe22ddc00dac65aa8bf1e84aefad6c43f SHA-256: 27348de2a0302c7ec83136f6c790fc2aba111ebe7d662ceef9729785c1ae7784
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • 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 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://botokaw.ru/award?keyword=3rd+grade+common+core+math+worksheets+pdf PDF link annotation
    • http://momentikshop.space/early_childhood_education_ielts_answer_keyphm0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453900/normal_5feefa6795699.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/9InBZhi/disney_plus_apple_tv_app_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/fusatogis/il6jfO0/kizexorokidusobozeforemi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388412/normal_5fc5de27efd7a.pdfIn PDF document text
    • http://shtangye.xyz/how_to_connect_bluetooth_speaker_to_alexaubla6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384836/normal_6023f194ea965.pdfIn PDF document text
    • http://igcopyrightclient.com/730857741494hzu8.pdfIn PDF document text
    • https://cdn.sqhk.co/zokosofu/Kjjanih/football_masters_euro_2020_pais_de_los_juegos.pdfIn PDF document text
    • https://cdn.sqhk.co/dejenuluzew/hchgggM/climbing_plants_for_fences_australia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471249/normal_5fc8c91f63284.pdfIn PDF document text
    • https://cdn.sqhk.co/kazipexe/Rgi4NWP/pirizeveme.pdfIn PDF document text
    • http://profoto22.ru/development_as_freedom_bookvbomp.pdfIn PDF document text
    • http://azalea.store/142163824371hb2a.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
    • https://520c840f-7702-4e28-87de-278da5b03b63.filesusr.com/ugd/e633b3_0c67daf4413e45ffae8fb972420ccf7e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wewiro/brookfield_asset_management_balance_sheet.pdfIn PDF document text
    • https://070488ba-e3d9-4c74-834b-445551f5513c.filesusr.com/ugd/fb83f1_4f567c34162f469f8475928dd94577b2.pdf?index=trueIn PDF document text
    • https://5457524e-bace-410a-9ce7-c8d8bc0eedea.filesusr.com/ugd/f0ffd0_bd13f58141d342a5986b1d8495aeaa04.pdf?index=trueIn PDF document text
    • https://c18d9829-3add-4afa-bc87-35007fe3998a.filesusr.com/ugd/70c1ec_538b5b5288104ba290c6d66a263a1a11.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/lezetu.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/mutixamazasobuxizowofo.pdfIn PDF document text
    • https://8860adff-7f0b-4cf3-a358-cdd560dff136.filesusr.com/ugd/625844_746273a1a7fe44769fbbf59183bc9a46.pdf?index=trueIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_53ab1a85fe44417f954da75cc8edec2a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gopuze/javiserofejotozusowuzifub.pdfIn PDF document text
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_97acf18aa55d49d39c345b7be95c1ec5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/7190787468.pdfIn PDF document text
    • https://cfecb619-c0f5-418d-ae9d-b1147643389f.filesusr.com/ugd/4cd51e_717bce89108d417e8d28a98ba3c85d98.pdf?index=trueIn PDF document text
    • https://6bfd3344-23d3-4e03-ab7d-00c1c23eecf6.filesusr.com/ugd/be19e1_e6fa70978778421b8bf2dad709dabe95.pdf?index=trueIn 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_off000125ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EA 5500 bytes
SHA-256: f640b4be0300f290475144b9786efa79df4563c1776cb61050f62f0b86df3d07
font_01_sfnt_off0001386b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1386B 11640 bytes
SHA-256: 74cef2cbcca61d165e784222c165173f60b5c2342efb31968d7548726eeb0f01
font_02_sfnt_off00015fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FE8 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361