Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6fb09a55609906f…

MALICIOUS

PDF

80.1 KB Created: 2021-03-03 06:34:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c125995e591542c53a8efa5b26637931 SHA-1: e7bb744bfa818e1e8b8f19c43266dbecb35b0021 SHA-256: a6fb09a55609906f618288ffdf4de0a87089a61f5de860e19aadf4dd99658be2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and 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 0.9996

Heuristics 5

  • 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 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://zajinet.ru/strik?utm_term=over+the+rainbow+judy+garland+movie PDF link annotation
    • http://studytogether.fun/27143244511svtm7.pdfIn PDF document text
    • http://jezolagewe.iblogger.org/rilaponev.pdfIn PDF document text
    • https://bufujibuku.weebly.com/uploads/1/3/4/8/134862056/3682426.pdfIn PDF document text
    • http://vurejowug.mypressonline.com/pokufosupadaler.pdfIn PDF document text
    • http://reduslim-italia.website/serie_alerta_cobra_legendadoriwnb.pdfIn PDF document text
    • https://femuketidoxesi.weebly.com/uploads/1/3/3/9/133997502/degale-vogoxojatak-xuzuwifokalorox-pomulujika.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370547/normal_6006c69096dd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408333/normal_603e813435f87.pdfIn PDF document text
    • http://setofexperience.site/ejemplo_de_dialogo_en_una_obra_teatralvrld8.pdfIn PDF document text
    • http://italysummer.space/43116173125k59pe.pdfIn PDF document text
    • http://wojesukuzak.mygamesonline.org/stihl_024_av_carburetor_adjustment.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475586/normal_5fcc303720230.pdfIn PDF document text
    • https://galanutix.weebly.com/uploads/1/3/4/5/134591813/bopaduna_mejajet_jelez_gizivoja.pdfIn PDF document text
    • http://duwudivusupo.mygamesonline.org/why_is_21_the_legal_age.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368501/normal_603a40a58bf3e.pdfIn PDF document text
    • https://vigoruso.weebly.com/uploads/1/3/4/1/134131386/diwota_zixetakerin_tiwixuxudu_wisezodufexetu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lujolugajejizog.epizy.com/55827384718.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/great_is_thy_faithfulness_sheet_music_piano.pdfIn PDF document text
    • http://zafujedimuf.epizy.com/binibaduzupoxiju.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/oracion_a_san_judas_tadeo_patrono_de_los_casos_imposibles.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/kms_activator_office_2013_windows_8.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/advantages_of_social_media_in_tourism.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_off0000f45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45B 5560 bytes
SHA-256: c79902d397167a20052d0ef02f8d9cc4031396093e29509881e2f3ba9fb6f0ff
font_01_sfnt_off00010731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10731 17440 bytes
SHA-256: e7903ebc6cb05b1d6d66f46f0f3cea0f2c99ddc15a3bb4a5561844851d9dc612

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