Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c68291f295bfd0d…

MALICIOUS

PDF

76.3 KB Created: 2021-03-01 07:39:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ac05a2f892943ed30dd1f7fde8ada2c7 SHA-1: 5ea04292515f6b22542fb64f50180021b6d9a5cf SHA-256: 4c68291f295bfd0d00c3004e759ec1c65d84e68fd63f5a89379efac4307fd656
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 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 5

  • 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://soxebez.ru/123?utm_term=at+the+cadian+ball+setting PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378856/normal_603c24afd24bc.pdfIn PDF document text
    • https://lebivituwaw.weebly.com/uploads/1/3/1/8/131856954/zejije.pdfIn PDF document text
    • https://komimuvupelogi.weebly.com/uploads/1/3/4/3/134312664/bitirivakawemid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424349/normal_602e87018084e.pdfIn PDF document text
    • https://radumudoxelis.weebly.com/uploads/1/3/4/2/134235428/c78e159b41884e.pdfIn PDF document text
    • https://pakoverixofe.weebly.com/uploads/1/3/4/7/134771358/tixipubu.pdfIn PDF document text
    • https://xuredetinumimo.weebly.com/uploads/1/3/4/6/134630251/ac5739bade4.pdfIn PDF document text
    • http://betixisu.22web.org/garareparebozun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413846/normal_600733a6abfe7.pdfIn PDF document text
    • http://fito4ka.xyz/how_many_essays_do_you_write_for_med_schoollseu7.pdfIn PDF document text
    • http://nesebonuvobeju.getenjoyment.net/84011796905.pdfIn PDF document text
    • https://tufelovewojamex.weebly.com/uploads/1/3/4/3/134331554/denugoxipudujidupori.pdfIn PDF document text
    • http://didazema.mypressonline.com/ohsen_1605_watch_manual.pdfIn PDF document text
    • http://andyhong.blog/learn_batch_file_programmingp7w23.pdfIn PDF document text
    • https://gozivuwedigati.weebly.com/uploads/1/3/4/6/134612943/dc848d7414.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kavisawadafo.epizy.com/how_to_access_icloud_on_android_phone.pdfIn PDF document text
    • http://wisalawisavu.epizy.com/94367785706.pdfIn PDF document text
    • http://pujumek.myartsonline.com/50887381965.pdfIn PDF document text
    • http://kulisiwodomewa.epizy.com/how_to_make_gift_ribbon_bow.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_off0000ecb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB0 5236 bytes
SHA-256: 4fd51d545e527d3d6dffa24c8afcbe75f79a1e053a6951c379a5c27e84685bb7
font_01_sfnt_off0000fe7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7A 11224 bytes
SHA-256: 0ad3beab6411a6c9f6115576253df6c155c64449c708c23fb82eeb98383294f8

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