Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf054dbe17cc6b15…

MALICIOUS

PDF

79.2 KB Created: 2021-04-01 09:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 862a5d44d9887322727f6abb0dce8ec7 SHA-1: c6affb05a7caafb6d4d165c05367c6e5b870e9b1 SHA-256: bf054dbe17cc6b15b4de8747a5db85c17a881545eb1d5d2eb817136cbcaf9644
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The primary attack pattern appears to be link farming or redirection to malicious sites, rather than direct exploitation within the document itself. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://xajibur.ru/strik?utm_term=stock+investing+for+dummies+4th+edition+pdf+download PDF link annotation
    • https://cdn.sqhk.co/mitajaso/gc5yFTK/king_dragon_restaurant_mauritius_menu.pdfIn PDF document text
    • https://pewatusikowago.weebly.com/uploads/1/3/2/6/132683224/b2f98.pdfIn PDF document text
    • https://lojodisomu.weebly.com/uploads/1/3/4/0/134042672/3645171.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/new_english_file_elementary_teacher_s_book_chomikuj.pdfIn PDF document text
    • https://cdn.sqhk.co/zolewiko/jibiihe/123_go_challenge_actors_real_name.pdfIn PDF document text
    • https://kupefuvewugixo.weebly.com/uploads/1/3/4/8/134849821/1924297.pdfIn PDF document text
    • http://nutetuxiv.mygamesonline.org/63517946037.pdfIn PDF document text
    • https://cdn.sqhk.co/xanuramalu/gcher7Z/dowalefewu.pdfIn PDF document text
    • https://tewuwixo.weebly.com/uploads/1/3/4/6/134629191/nuzulalomi_kaluxif_mumuvanepixuded_bujetobamax.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/jidagafinuxesu/kemodokunegejuxef.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/why_would_a_judge_appoint_a_guardian_ad_litem.pdfIn PDF document text
    • http://ruruwuvatokatal.onlinewebshop.net/pisogarusetimovoj.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/79158370322.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/what_is_site_visit_process.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/tujil.pdfIn PDF document text
    • http://winimoviwimi.myartsonline.com/74861344645.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/statistics_david_freedman_free.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_off0000f42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42B 5976 bytes
SHA-256: 5158c8dcb1bbe8a4bca2f142798f44b3bdd7a73a5cd271e509e9b9b782acf2e2
font_01_sfnt_off00010878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10878 11376 bytes
SHA-256: 23433fa203eef17fc66d87039abf9f66e6fe63dd29803a9adacb43f83ef3a9b2

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