Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f320b6a27c5e33d…

MALICIOUS

PDF

78.2 KB Created: 2021-04-01 17:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: acce2488154702f8a52560afa1955486 SHA-1: 693a49878b7564a6a9efb480d00245e3d589989d SHA-256: 2f320b6a27c5e33d1bac359af6c680bebcca658b14ee520555006e2bb8da3904
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm designed to generate SEO traffic. The document body, though partially corrupted, suggests a lure related to 'Vocabu-lit level j answers', directing users to malicious URLs. ClamAV and ML classifiers confirm the malicious nature, flagging it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://xajibur.ru/wix?keyword=vocabu-lit+level+j+answers PDF link annotation
    • http://navevukosuso.mypressonline.com/togokavekefonitumokave.pdfIn PDF document text
    • http://bevamifugidujew.scienceontheweb.net/oxford_student_atlas_map_book_download.pdfIn PDF document text
    • http://baliferifopiz.mypressonline.com/essentials_of_entrepreneurship_and_small_business_management_norman_m_scarborough.pdfIn PDF document text
    • https://cdn.sqhk.co/xerolunem/dhgFgce/mezidapumopab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469836/normal_60201baa3b78f.pdfIn PDF document text
    • http://supusatode.sportsontheweb.net/poxogofemelumudozijula.pdfIn PDF document text
    • https://cdn.sqhk.co/fibapezo/8Xmbhfq/angular_6_format_number_with_commas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409396/normal_5fed80aeaae55.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jasunusemoki.onlinewebshop.net/felupegixawuka.pdfIn PDF document text
    • http://pumajuxav.rf.gd/vagumawokuwalejarerewew.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/guide_to_drawing_cartoon_eyes.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/who_is_nandhini_in_ponniyin_selvan.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/13298196124.pdfIn PDF document text
    • https://27475d5a-2981-497d-8cd5-0c310ef10f8b.filesusr.com/ugd/9cb927_d386b2cedbeb4e8780b4bc001f4a3ed3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/40117976927.pdfIn PDF document text
    • http://garamerese.rf.gd/5322587700.pdfIn PDF document text
    • https://183cab0c-2e2b-44e6-b55a-0f82cb58e578.filesusr.com/ugd/133137_0e57b0b924324423a76bf1fcb8178b70.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rumezo/billanook_college_uniform.pdfIn PDF document text
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_e4c2127be39f418fb80a32ff26555da0.pdf?index=trueIn PDF document text
    • https://e301b21f-f707-426c-a094-6199d4b1a2d6.filesusr.com/ugd/f65518_75d73ab475794985ad7f1216e055f7a7.pdf?index=trueIn PDF document text
    • https://1eba3b37-3dce-45e8-aa15-e51a58efc0fe.filesusr.com/ugd/89e37c_c04dd0279a7a41f4a54ca572632953ee.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_off0000f23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23E 5160 bytes
SHA-256: e70ab9eb51063d3a2342f9b9c962b73eb09a7a6994b134aa12bdfed7b5cbf716
font_01_sfnt_off000103f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F6 11240 bytes
SHA-256: 0dcb2e3dc072ae4196fd937aef74ae5d2c89ea03ff48333cf065ad99c2594278

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