Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdbc742d048eb530…

MALICIOUS

PDF

78.8 KB Created: 2021-05-13 00:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5bf9f745fcbd49d35190e326585e7ffd SHA-1: 1a60fa26b3b1c69e319528a91f7cdf4582da6004 SHA-256: cdbc742d048eb530a3805ebbbe7c032bdef65c9a01d91d249b500c3fe10afcc8
126 Risk Score

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 0.9997

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://seumenha.ru/strik?utm_term=data+structures+in+computer+science+pdf PDF link annotation
    • https://toxovapuwelubu.weebly.com/uploads/1/3/4/7/134733969/vugurili.pdfIn PDF document text
    • https://kuwodugedo.weebly.com/uploads/1/3/0/7/130739904/wumudiwegeku.pdfIn PDF document text
    • http://giluxorasij.22web.org/gobisomawusewatavusizez.pdfIn PDF document text
    • http://zomewegi.iblogger.org/karaban.pdfIn PDF document text
    • http://ferategaj.scienceontheweb.net/budaya_melayu.pdfIn PDF document text
    • http://bodipok.getenjoyment.net/rutekisobukuzigedapiwe.pdfIn PDF document text
    • http://werojati.getenjoyment.net/b._p._ed_books_download.pdfIn PDF document text
    • https://lilepixot.weebly.com/uploads/1/3/4/4/134462463/2320646.pdfIn PDF document text
    • http://kidulukapaxarej.iblogger.org/angeles_cantando_estan_letra.pdfIn PDF document text
    • http://dipunag.getenjoyment.net/gukapibo.pdfIn PDF document text
    • http://vopezikililurab.mygamesonline.org/cahier_vacance_maternelle.pdfIn PDF document text
    • http://kepuxom.mypressonline.com/berazuxi.pdfIn PDF document text
    • http://ligexekena.mywebcommunity.org/berlin_conference_scramble_for_africa.pdfIn PDF document text
    • http://gevejune.iblogger.org/500_opposite_words_in_english.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xebiramipi.epizy.com/stargirl_book_movie.pdfIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_33be86b639444c8bab7528827a1a4011.pdf?index=trueIn PDF document text
    • https://26bfc7ce-baa4-43a1-9280-72312523cbd3.filesusr.com/ugd/5af86b_528da3f5181f474885907375a2c1171a.pdf?index=trueIn PDF document text
    • https://0ea28b16-58c2-472d-b6be-3e97fe9b7bb6.filesusr.com/ugd/696b8a_df069c2fb65b4555b14086b57bec1412.pdf?index=trueIn PDF document text
    • https://8a7e94d2-1b07-4399-8a7b-cfebf1eb419e.filesusr.com/ugd/e78b77_3973a687310b485c9b746f438bcad263.pdf?index=trueIn PDF document text
    • https://ddd90330-5837-4e0c-b2f6-9383941cd2db.filesusr.com/ugd/568e2c_bca05c24d4d54582942a59347e85b043.pdf?index=trueIn PDF document text
    • http://muzubakow.epizy.com/audi_a3_2008_owners_manual.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_off0000f285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF285 5268 bytes
SHA-256: d2d77f8e53016edcbfc1d0c22a61660321a0dd38120b1051fc6885b92722d87e
font_01_sfnt_off00010463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10463 11812 bytes
SHA-256: aee68fa9ebced384532831e06b50653ceece952d0700c4db4a1ef819f3904ef4

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