Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6bcfef9f282f5e4…

MALICIOUS

PDF

78.6 KB Created: 2021-03-30 14:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1e0a9e9af71dee07f55b569c1817e8ae SHA-1: c60b9fc19ec1697fda95f503b80357849328eab2 SHA-256: c6bcfef9f282f5e4a71c25cdefbdf077b6a72c0f87b7e43c117b0e402b97526a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/strik?utm_term=samsung+gt-p3113+won%2527t+turn+on PDF link annotation
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/denidodobakuzuje.pdfIn PDF document text
    • http://debegezuvume.iblogger.org/jumanumovujaxuv.pdfIn PDF document text
    • https://mazoguwikite.weebly.com/uploads/1/3/4/6/134614920/a1ca05227fa8e8.pdfIn PDF document text
    • http://jawogili.22web.org/algorithme_de_tri_par_insertion.pdfIn PDF document text
    • http://wumewil.sportsontheweb.net/english_grammar_word_search.pdfIn PDF document text
    • http://gesetaxoxu.sportsontheweb.net/how_much_do_foster_parents_get_paid_in_va.pdfIn PDF document text
    • http://dexujin.iblogger.org/jevesowuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c030440e-e97c-4a61-b46b-24b5146652c1/dizemikib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4ca8afa-50c7-4986-a263-d00c3fde6e71/the_white_princess_book_read_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d01b6710-5149-4137-b00a-c6c3b7b3f467/java_8_in_action_lambdas_streams_and_functional-style_programming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07b1ebbe-af5d-4870-b193-4556fae523d2/koguvurinabajumas.pdfIn PDF document text
    • https://50e0a74f-e7a5-4ac3-a7a6-4cdd7b1ad00e.filesusr.com/ugd/8a9d9f_4773cbd72d4e46bc88cb03bbd583563e.pdf?index=trueIn PDF document text
    • http://zakefuki.myartsonline.com/vijakulakobabexu.pdfIn PDF document text
    • http://magakawigola.epizy.com/vidmate_app_android_version.pdfIn PDF document text
    • http://xeleleragakiji.epizy.com/3464418976.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12963185-7408-417c-ae11-987d721eea24/workpro_quantum_9000_office_chair_canada.pdfIn PDF document text
    • http://bopexetosezulav.rf.gd/definition_of_technology_adoption.pdfIn PDF document text
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_b021d5322e5a42dba75bf0cbc0e927c6.pdf?index=trueIn PDF document text
    • http://gakuxalodakedaj.epizy.com/principal_geotechnical_engineer_salary_australia.pdfIn PDF document text
    • http://larotusen.rf.gd/20343900566.pdfIn PDF document text
    • http://famuruvif.epizy.com/java_8_144_64_bit.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DE 5584 bytes
SHA-256: e50858ee272c64ffe38cdefae38a30055f3466cece67019828dd7082f11a44fc
font_01_sfnt_off000107f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F3 11080 bytes
SHA-256: 1307ce69b0bdda1eac888308ad7bfb87cb39a7776d0d21e12dcfda2385557b7d

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