Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7bda9635e9b95f7…

MALICIOUS

PDF

74.1 KB Created: 2021-03-02 07:02:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 21f8d0627a72edb46526c292a8d9de4c SHA-1: d2dbf21b7af5a7694d1b8199dc0bb6adf02a3af4 SHA-256: a7bda9635e9b95f7851ed886af6e5769e80393db9b7ce91059130c961fc4329c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=brown+and+tan+male+dog+names PDF link annotation
    • http://temilops.xyz/census_of_marine_life2aw12.pdfIn PDF document text
    • http://itanto.space/46377858492owqyw.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvaratuji/mnXahdv/slime_live_wallpaper_apk.pdfIn PDF document text
    • http://instup.xyz/707544579743gi6t.pdfIn PDF document text
    • http://teaitalis.space/523823740004w8qo.pdfIn PDF document text
    • https://mujugoseboli.weebly.com/uploads/1/3/4/3/134312554/4988788.pdfIn PDF document text
    • https://cdn.sqhk.co/jasowipe/fMjajeu/norse_mythology_gods_and_goddesses_family_tree.pdfIn PDF document text
    • http://rating-bookmaker.ru/bogizegoipty.pdfIn PDF document text
    • https://cdn.sqhk.co/bimolixumotu/jeEuwij/gorillas_in_the_mist_book.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/gupawupigawono/67411528578.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/aruvam_movie_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/microsoft_dynamic_crm_developer_guide.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_off0000e672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE672 5288 bytes
SHA-256: c52107b8c6a6bb49985c6497f0a27247b39a247d8260e5183a70ce8cc87b8ddc
font_01_sfnt_off0000f86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86A 10440 bytes
SHA-256: e4e6a6b1148f97e174ec1f431ba19af131c50df64efb72758b9a0b78b033d94a

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