Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ad2cbc1ceb237f…

MALICIOUS

PDF

77.8 KB Created: 2021-03-17 09:24:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 5a5923954df1d677e9b14f292f60150e SHA-1: 801a5a2e50d98f34bc6c0c726dfc2e97e422a216 SHA-256: 25ad2cbc1ceb237f8541d8e979216274bcf01ee005bec83e2e89f59804993033
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous external URLs embedded within it, likely for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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://zajinet.ru/wix?keyword=gt08+smart+watch+user+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/tuxonewebuke/jbiegrA/kojogodes.pdfIn PDF document text
    • https://veriketosamu.weebly.com/uploads/1/3/4/6/134675732/sujoguwimete-dizefupa.pdfIn PDF document text
    • https://wisiwojapano.weebly.com/uploads/1/3/4/8/134896472/7979437.pdfIn PDF document text
    • https://cdn.sqhk.co/xidizizo/Lhchgij/fekulo.pdfIn PDF document text
    • https://nerilumasufut.weebly.com/uploads/1/3/1/4/131437044/6fc7f409a.pdfIn PDF document text
    • https://cdn.sqhk.co/deloreba/eERDQV5/terra_hexen_z_lodzi.pdfIn PDF document text
    • https://fojozotewimoko.weebly.com/uploads/1/3/5/3/135324817/regudefujexeper_valiki.pdfIn PDF document text
    • https://pizovepe.weebly.com/uploads/1/3/5/3/135323062/8209210675.pdfIn PDF document text
    • https://cdn.sqhk.co/zogowefu/icAVU7k/smash_bros_brawl_unlockables.pdfIn PDF document text
    • https://doxazefeseremef.weebly.com/uploads/1/3/4/7/134764644/zonegalubej.pdfIn PDF document text
    • https://naroxelilokatud.weebly.com/uploads/1/3/1/3/131384214/1218270.pdfIn PDF document text
    • https://tubidexoz.weebly.com/uploads/1/3/5/9/135994678/8572ff20ee76.pdfIn PDF document text
    • https://cdn.sqhk.co/toxodimina/nxtFjg5/vozabuvapitug.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/dinisemowoge/consumer_reports_most_reliable_cars_2015.pdfIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_01fd4a44eae94297896dea94777ceb09.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/desivokafukirak.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/java_online_test_with_answers.pdfIn PDF document text
    • https://28f4efd1-2881-4507-ad14-783cbe09f3b0.filesusr.com/ugd/7dd30d_9eb136c9c345410c95bf6a393aab0c3e.pdf?index=trueIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_f315fda2dd3d4e75b555cf4c73e00ea1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/adelle_basic_font_free.pdfIn PDF document text
    • https://6131fb9f-3080-406c-a6ab-c4686b6a2f6f.filesusr.com/ugd/52be6f_8511bd1d1d1a4b50b80232cbb66505e8.pdf?index=trueIn PDF document text
    • https://ad323f3e-245e-4e3c-8b16-de91fefec063.filesusr.com/ugd/5ea691_2f2d1428a781446da1bc9ee82738c886.pdf?index=trueIn PDF document text
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_a8daffe2b8d044bb9ce0bbfde6527485.pdf?index=trueIn 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_off0000f085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF085 5852 bytes
SHA-256: 2ee2a0c44f27149c29a1c8d8e944b3d9ec76f8097330bf6f918b0f5c39d20b7a
font_01_sfnt_off00010460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10460 10460 bytes
SHA-256: 4a8d94eba091e27c958db47631e118a4d6eb43b6c9a56870adc21b8bc7ae3863