Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fb849fdc1e7f4f6…

MALICIOUS

PDF

76.0 KB Created: 2021-03-05 08:45:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: ae5e77dfd0f8b45a8612031a52c15868 SHA-1: 8ba8c6f1df13e88d0f8871212fce2efd24c37032 SHA-256: 9fb849fdc1e7f4f61797784855bef9bd70127e61615ecfad4e3418c9af5900a4
214 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms. The primary malicious link identified is `https://crophysi.ru/123?utm_term=maytag+dryer+model+medx655dw1+timer+not+working`, which is designed to lure users with a seemingly relevant search query. The presence of numerous other PDF links suggests a link-farming or SEO manipulation tactic, likely to obscure the malicious intent. No scripts were extracted, but the PDF structure itself is used to host and present these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=maytag+dryer+model+medx655dw1+timer+not+working In PDF document text
    • https://cdn.sqhk.co/pajerelo/haWZt8A/lucky_brand_deals.pdfIn PDF document text
    • https://kavisovilige.weebly.com/uploads/1/3/5/3/135308643/3873721.pdfIn PDF document text
    • https://lepitedow.weebly.com/uploads/1/3/4/8/134885181/614e1c5c45f.pdfIn PDF document text
    • https://cdn.sqhk.co/wemegofuk/dS9jhgf/95130035087.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/lovely_by_billie_eilish_viola_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/variance_of_two_uniform_distribution.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/17071810502.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33a19180-f746-46e4-a841-8146350afee8/how_to_study_for_clep_english_composition.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/word_viewer_2013_microsoft.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba7edb29-8d5b-4e64-8dfa-80eef85cd18e/44347809878.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18c2a07a-dd5e-421e-83b5-d75bbadc36a6/how_to_heal_picked_acne_overnight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b54f0e95-f844-4144-bce6-483f31020f2d/what_is_another_word_for_pseudo_listening.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36c117a9-88dd-42c8-90e5-9c5ff25460b5/55752388556.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc610bc1-0a20-42d4-b69c-f47a6fcbd5e6/xukevitelawilenir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/401a4792-9d93-4df4-96e9-48693dee2df0/bunufesuvefugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89b090c3-2f01-4e30-9250-d6662a105be0/jabamor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e56c6a18-e501-4c40-b8a9-8edeee57dc72/how_much_do_water_softeners_cost_uk.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_off0000ece8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE8 5628 bytes
SHA-256: 01d60a6408fa3bf33436adea995cab0283adf218da48e0b2a28c3af5a68fc947
font_01_sfnt_off00010030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10030 10208 bytes
SHA-256: 0feb54f261985ee961e56f2318e24d57913c9ef456f985b1e44271c492bef8ff

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