Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff7a1a2e637ffc44…

MALICIOUS

PDF

80.9 KB Created: 2021-03-25 17:24:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddabbe2fee3c8d5ddbdb7fe6b48b69be SHA-1: db2c6eb4eabf563804442418262d7a08e7a391bd SHA-256: ff7a1a2e637ffc44950009f91b4f4ab952c5e3fb71e0340a9ab0a63e8eda66fd
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a tactic often used for SEO farms or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites, likely as part of a phishing or malicious content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/award?keyword=tipos+de+apresenta%25C3%25A7%25C3%25A3o+fetal+pdf
    • https://mozeduxazos.weebly.com/uploads/1/3/4/0/134018133/90afa32298.pdf
    • https://cdn-cms.f-static.net/uploads/4408335/normal_60369c7fb8341.pdf
    • http://gta-msk.ru/el_pollo_loco_healthy_bowlsre0wa.pdf
    • https://zudobusida.weebly.com/uploads/1/3/5/3/135330479/3601879.pdf
    • https://ziluxofizavamo.weebly.com/uploads/1/3/6/0/136009732/4705536.pdf
    • https://static.s123-cdn-static.com/uploads/4453550/normal_5fe028718d546.pdf
    • http://winfreeiphone.xyz/33659502023f5ozn.pdf
    • http://birjand.design/website_templates_for_photographywo70n.pdf
    • https://kuduxuke.weebly.com/uploads/1/3/5/3/135323303/849202.pdf
    • https://cdn-cms.f-static.net/uploads/4445130/normal_602717ba9f643.pdf
    • https://cdn-cms.f-static.net/uploads/4424630/normal_603741247b4e3.pdf
    • https://static.s123-cdn-static.com/uploads/4416128/normal_6007b3dc3cdd2.pdf
    • https://vofodiwe.weebly.com/uploads/1/3/5/3/135350815/4745361.pdf
    • http://esplus.pro/39695832515pbsut.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/zaxawetawupo/how_to_increase_mental_toughness_in_sports.pdf
    • https://s3.amazonaws.com/nefomojuwet/kendrick_lamar_humble_piano_sheet_music.pdf
    • https://s3.amazonaws.com/bogeguva/32486476181.pdf
    • https://3b0fe5ff-7f86-489c-8138-fc984e51136c.filesusr.com/ugd/bfd78a_8fa05a0cf7c14062b0c28028dfc051c4.pdf?index=true
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_441b22843e1a43febf11eaaf70713564.pdf?index=true
    • https://s3.amazonaws.com/rujabepifar/g_shock_ga_1000_1a.pdf
    • https://s3.amazonaws.com/vabedafozo/jasper_report_table_header.pdf
    • https://s3.amazonaws.com/jevopemosod/pocoyo_full_episodes_in_english_free.pdf
    • https://748e6e98-33e2-4bd1-95aa-01ea3505a154.filesusr.com/ugd/704f6c_37bef7a8db364ab7a4dea08aeb10df9c.pdf?index=true
    • https://s3.amazonaws.com/sorogamat/is_gta_6_gonna_be_on_ps5.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebf6.bin
e72703c0cdeece39aa7294bfeaaf615cb3c2effa1a48efcdab48b609cb14dbdf
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF6 5272 bytes
font_01_sfnt_off0000fd4b.bin
faf17499c57331fd99f8fced2158e9d0b7bddba32986f8455c12c0a1de9b3796
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4B 13692 bytes
font_02_sfnt_off000125db.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x125DB 4324 bytes