Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c332eb0ac2cd7bf…

MALICIOUS

PDF

67.0 KB Created: 2021-05-01 21:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 950511e34e2511dda1bf8dbbc785bd3a SHA-1: 24f120cd84768e12edefd10946940343739de855 SHA-256: 9c332eb0ac2cd7bfb4f4a98a53d43d9f56b2c0baa5d1e241e524003f9f4cffb7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a malicious intent to direct users to potentially harmful websites. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malicious redirection attack.

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-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://xezojetit.ru/strik?utm_term=is+the+netgear+nighthawk+compatible+with+fios
    • http://folugomobok.getenjoyment.net/validity_and_reliability_of_questionnaire.pdf
    • http://begedotupatato.66ghz.com/corel_draw_x7_keygen_crack_working.pdf
    • http://watogoda.mypressonline.com/a_to_z_opposite_words_list_download.pdf
    • https://static.s123-cdn-static.com/uploads/4499972/normal_5fd03dfc5b99a.pdf
    • http://fiduwil.iblogger.org/laboratory_attendant_admit_card.pdf
    • http://jepewadagamer.scienceontheweb.net/beethoven_silence.pdf
    • https://cdn-cms.f-static.net/uploads/4473062/normal_6056e4cca8677.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/51f04e6f-adce-4fbb-bcd0-a33cb6d2dec3/where_can_i_buy_premier_protein_caramel.pdf
    • https://uploads.strikinglycdn.com/files/c3e7689b-5951-4c23-b5b4-19923c09c097/prodigy_hegelian_dialectic_the_book_of_revelation_cd.pdf
    • https://uploads.strikinglycdn.com/files/ed4bc585-dfd8-4094-98a7-4418f61a31f6/great_writing_4_fifth_edition_answer_key.pdf
    • http://xazawipobu.rf.gd/24306367614.pdf
    • https://uploads.strikinglycdn.com/files/6734f1ca-02ce-4f99-be7e-538e57aefc9d/57578279569.pdf
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_5eadb6097d964dd081acd72dc407954f.pdf?index=true
    • http://jaxarafepemu.epizy.com/nombre_rationnel_et_irrationnel.pdf
    • https://uploads.strikinglycdn.com/files/e8fe5567-df30-4207-a387-be77911bbf1c/how_do_you_achieve_your_goals_essay.pdf
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_761da760c89741d29a8dad30c75202a4.pdf?index=true
    • http://jabodegodonirad.atwebpages.com/boatsmart_exam_study_guide.pdf
    • https://uploads.strikinglycdn.com/files/9fc48b6b-3368-47dd-8e86-e125fc62b24f/11784397122.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8bf.bin
33acec3c672b39bec6ec24619004d715602b1f8796be2624b7d48b63a83c22b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BF 5660 bytes
font_01_sfnt_off0000dbf0.bin
a88f6be621fd5071d6a99c374ef4194195bcdb76aeb2b04be3a3e3c1a5cb075f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF0 10156 bytes

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