Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e95c286ec4a1076…

MALICIOUS

PDF

85.2 KB Created: 2021-04-23 15:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7ebba86fec1c94411c899afbfd569d2c SHA-1: 2e7f3ac95dadf1ba5e3520276030234235c787a1 SHA-256: 0e95c286ec4a107620f4724474494e8eb6225a7666248a9961b73654e568394a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://pelibifir.ru/strik?utm_term=how+to+assess+learning+outcomes', are likely used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=how+to+assess+learning+outcomes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472479/normal_605f9aaf59b8a.pdfIn PDF document text
    • https://cdn.sqhk.co/safubuguva/AigjEUN/download_game_drake_n_trap_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445742/normal_5fea2bff9a6e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403565/normal_605674db3a89d.pdfIn PDF document text
    • http://fumizudo.sportsontheweb.net/sokamekil.pdfIn PDF document text
    • http://gedirobidepud.scienceontheweb.net/remakiterowadox.pdfIn PDF document text
    • https://cdn.sqhk.co/begokaxawip/jdjeoZp/48943846380.pdfIn PDF document text
    • http://natosabi.mygamesonline.org/25703647472.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500425/normal_603b4df2382c8.pdfIn PDF document text
    • https://cdn.sqhk.co/nubokeso/vRhhMjc/earthing_bed_sheets_canada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420924/normal_604656154ade8.pdfIn PDF document text
    • https://cdn.sqhk.co/vozogekom/9lgjoWV/guilty_crown_op.pdfIn PDF document text
    • https://cdn.sqhk.co/zezoxomop/hGA5Djh/60338870129.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/b5gfPey/beiimaan_love_full_movie_worldfree4u.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/hfjigfS/g_stomper_rhythm_review.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/gfLotQ0/hand_drill_for_resin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dopesesowo.epizy.com/32785363335.pdfIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_3ae2bd25e3b246a682b707689b0c355a.pdf?index=trueIn PDF document text
    • http://tamufigavoxi.rf.gd/89218287439.pdfIn PDF document text
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_8132d3dd91f0488c8e734c40aa81c909.pdf?index=trueIn PDF document text
    • http://kagadagofos.epizy.com/wuromowasixotosuvinaliruv.pdfIn PDF document text
    • http://lagarudu.epizy.com/edge_browser_for_windows_7.pdfIn PDF document text
    • https://62dace35-232c-43a2-b3e8-6cf19ad57148.filesusr.com/ugd/42ae31_ad5a332c747f4afba408b7209125c530.pdf?index=trueIn PDF document text
    • http://kewupuz.rf.gd/icd_10_code_for_boutonniere_deformity.pdfIn PDF document text
    • http://gakajitaju.atwebpages.com/60318584002.pdfIn PDF document text
    • https://8d40832c-2e2b-4284-8151-bb35a16d80ac.filesusr.com/ugd/05d014_9c6e233410c64c0994628c3c7ef29294.pdf?index=trueIn PDF document text
    • http://fusozevukatamir.atwebpages.com/legosepixir.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA74 5172 bytes
SHA-256: 227feb1c71004e4ad25398b8409129d9834afb483c199c634e549cad83433489
font_01_sfnt_off00010c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0B 10680 bytes
SHA-256: 111bd941d544e28d8284df1a3f1edfc1259d4e354f43beef2afb1fb92bdcf24d
font_02_sfnt_off00013020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13020 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501