Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c51da1ca5c0c433…

MALICIOUS

PDF

79.3 KB Created: 2021-05-20 09:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4bcc498239f5212b164f5e54987d161d SHA-1: 16c368b55601900b282df20cef142d781fec4801 SHA-256: 1c51da1ca5c0c433771fe11a655343f9ce3a33731cb835790fb0fdb989be2893
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

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/strik?utm_term=adobe+illustrator+cs6+mac+serial+number+hack PDF link annotation
    • https://rewagafiwexufot.weebly.com/uploads/1/3/1/8/131856649/dilema_tizaxa_wonanovisuj.pdfIn PDF document text
    • https://satomasutal.weebly.com/uploads/1/3/2/6/132681949/gaxubomobigufi.pdfIn PDF document text
    • https://tabureribe.weebly.com/uploads/1/3/0/8/130813037/vuveduta.pdfIn PDF document text
    • https://gorokawuse.weebly.com/uploads/1/3/4/4/134489158/muzak.pdfIn PDF document text
    • https://niwejeru.weebly.com/uploads/1/3/4/3/134308800/kadevazat.pdfIn PDF document text
    • https://xokefinodoju.weebly.com/uploads/1/3/5/3/135316617/64263.pdfIn PDF document text
    • https://wisatevifo.weebly.com/uploads/1/3/0/7/130775851/ribonifotogesa.pdfIn PDF document text
    • https://nofakuxuwuxow.weebly.com/uploads/1/3/4/6/134684799/2717104.pdfIn PDF document text
    • https://zumusikibalagop.weebly.com/uploads/1/3/4/0/134096359/884407.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/brahmo_samaj_in_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6b648c1-358c-4339-b44a-810a7c8ee6ea/fisepene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/096a29f3-329c-46cf-8f5d-9803d8deba03/a_link_to_the_past_3ds_walkthrough.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0feef8fc-d38c-4b9f-8859-735f407b1706/60170976525.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c67efdb7-a4da-4204-98b6-24dc9e9807b7/wards_signature_sewing_machine_uht_j276d.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bb3e026-75bf-4f27-b4ae-3420522050c1/fegabibet.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/wekeziwexulifebatavaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4dd54dd-2db4-4a09-8751-f21127f60348/how_to_defrost_small_fridge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e86898f-e608-4415-8b73-958c24b8a980/26122752061.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5df821f4-63a8-4b99-bd25-6aabe3833507/burozufatuxuwujoris.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_off0000f6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D0 5524 bytes
SHA-256: 4db29bf00621d32ee5d9ebbd1f7a9c35b1dcdef30a854f41beda212c62095f7a
font_01_sfnt_off00010967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10967 10596 bytes
SHA-256: 6ec5b4dfa025477cbe433b0f692af002c019e93717708f4769a16c10ca22d37e

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