Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a8a21664661886…

MALICIOUS

PDF

80.9 KB Created: 2021-03-20 01:41:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4f7a58ec4b68c7a093546364a176a4d SHA-1: 5c52cce0606320692ab543ee4f0ad0afdcc97d16 SHA-256: 88a8a21664661886137423c966f3b10e0b99a56e306d70796cadf1cb019ad9c6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, suggesting it is part of a link farm designed to direct users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/award?keyword=american+journal+of+agricultural+economics+pdf
    • https://cdn-cms.f-static.net/uploads/4426812/normal_5fe650897e705.pdf
    • https://cdn-cms.f-static.net/uploads/4451377/normal_60443b6e9c988.pdf
    • https://cdn-cms.f-static.net/uploads/4463298/normal_602662c0b6d0e.pdf
    • http://vatetuda.scienceontheweb.net/defaxejagib.pdf
    • https://static.s123-cdn-static.com/uploads/4413126/normal_600242215e631.pdf
    • https://cdn-cms.f-static.net/uploads/4369494/normal_605012be20ad2.pdf
    • http://netopodimamo.mywebcommunity.org/10146365052.pdf
    • http://nedosako.iblogger.org/merit_badge_series_books.pdf
    • https://cdn-cms.f-static.net/uploads/4420438/normal_603118c56e33f.pdf
    • https://cdn-cms.f-static.net/uploads/4365652/normal_6022ade298c41.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fubewog.rf.gd/what_does_break_on_through_to_the_other_side_mean.pdf
    • http://fobupozomorefiw.epizy.com/kiranuwor.pdf
    • http://padusij.onlinewebshop.net/apprendre__lire_l_arabe_rapidement.pdf
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_d7397488ac8f418aab85f75a37e6b720.pdf?index=true
    • https://e966359d-176b-477a-9ad9-c314bea94227.filesusr.com/ugd/fa6f14_8b160c9997f34ec485ea58cb99d35933.pdf?index=true
    • http://kilarosine.atwebpages.com/57573107859.pdf
    • http://lamupilabixekuw.epizy.com/49259482453.pdf
    • https://d992f69e-bc5b-430a-92d7-abfd66d0380b.filesusr.com/ugd/6f7357_f4dc19eb2bdb40e1b392e4d3c0a5be82.pdf?index=true
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_87925a43075d4ababfedb04ddd3f005b.pdf?index=true
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_1fbb4c4ce0204c068737bc428abda692.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbed.bin
36d4312cd4984490ac387f91a7c323daad175dca57bf968323dadf223445add8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBED 5540 bytes
font_01_sfnt_off00010eb8.bin
9fa33125820dd5dc641fccfc0ca2ef9c9ac37998ece91cdad5c64ccf556fbefc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB8 12488 bytes

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