Malicious PDF — malware analysis report

Static analysis result for SHA-256 1551b44678a1a489…

MALICIOUS

PDF

76.9 KB Created: 2021-03-27 16:53:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 7eaaccaa2562965f439c9ceef40c2a5f SHA-1: c398224f05968b32cd5edef4d00ed8b602a55740 SHA-256: 1551b44678a1a48989aa2e2a05860583fdf83e169d33e85ce50f86f6e1f7cdaf
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic identifying a large farm of external PDF links. One primary URL leads to a site that appears to be part of an SEO manipulation scheme, while another points to a benign PDF. The ML classifier strongly indicates maliciousness. Although no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious or SEO-abused content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/strik?utm_term=vector+geometry+exercises+pdf PDF link annotation
    • http://firstreadersclub.com/how_to_replace_black_ink_cartridge_hp_envy_4500uneva.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374715/normal_5fe5e56fa1e81.pdfIn PDF document text
    • https://tifuxifig.weebly.com/uploads/1/3/2/6/132695942/bfbf56.pdfIn PDF document text
    • http://banquepopulaire-fr.org/age_of_empires_2_multiplayer_crackydhdp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369166/normal_600be7df7873d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380083/normal_5fee3c20ca1b8.pdfIn PDF document text
    • https://kakijukiwobak.weebly.com/uploads/1/3/4/3/134322026/5c94d2ed401fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411246/normal_5fdf36b7d98b3.pdfIn PDF document text
    • http://healsmall.space/lerivasozosisopezufabawelch6xn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455387/normal_5fcab07a11c7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405638/normal_5fda954048fd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404515/normal_6010a6d33fb75.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365662/normal_6000537591494.pdfIn PDF document text
    • http://netlysy.online/59582548783kc7en.pdfIn PDF document text
    • http://demask.space/airplay_mirroring_for_androidiofcv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376101/normal_5fdca34a2a4bd.pdfIn PDF document text
    • http://garant-ritual.online/vr_v8_brake_boosterf0a6c.pdfIn PDF document text
    • http://forsage.pw/lexerazazxe8gz.pdfIn PDF document text
    • http://fly-drive.online/how_much_does_a_union_pipefitter_make_in_ontario54fll.pdfIn PDF document text
    • http://besuxiju.22web.org/weekly_planner_excel_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pejinubonuxus.epizy.com/a_crucial_moment_meaning.pdfIn PDF document text
    • http://danasavej.epizy.com/87796860481.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_off0000ece5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE5 5368 bytes
SHA-256: 114a2adf23fd8dffe5be2884cd596bc0fc026d47df381008c89263245f5ce8f4
font_01_sfnt_off0000ff2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2F 11516 bytes
SHA-256: 463a1b777b6bc5ab494b54abecb95a7f73e399c4a30de347a13763e0b04b3bc0

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